Overview

Helpful code snippets will show up in this column.

curl https://app.asana.com/api/1.0/users/me \
  -H "Authorization: Bearer 0/a7f89e98g007e0s07da763a"

const asana = require('asana');

<?php
require 'php-asana/vendor/autoload.php';

import asana

import com.asana.*;

require 'asana'

The Asana API is a RESTful interface, providing programmatic access to much of the data in the system. It provides predictable URLs for accessing resources, and uses built-in HTTP features to receive commands and return responses. This makes it easy to communicate with from a wide variety of environments, from command-line utilities to gadgets to the browser URL bar itself.

The API accepts JSON or form-encoded content in requests and returns JSON content in all of its responses, including errors. Only the UTF-8 character encoding is supported for both requests and responses.

Notes on Pagination

Pagination is an important concept when working with queries for multiple objects. Requests with large result sets may timeout or be truncated; therefore, pagination is strongly encouraged to ensure both you and your users have the best experience when using the Asana API.

Happy coding!

Object Hierarchy

Asana is a work tracking and collaboration tool. This guide is designed to give developers a brief overview of how Asana is structured. It’s not meant to be exhaustive and may be too basic for experienced Asana users. The intention is to describe the fundamental elements of Asana to help you scope apps and avoid common points of confusion.

How work is organized

Tasks

Tasks are the basic unit of action in Asana. Tasks have many fields including a single assignee, name, notes, followers (i.e. collaborators), likes, and comments (among others). Tasks inherit custom fields from their parent project(s). Custom fields values are set for each individual task.

In addition to standard Create / Read / Update / Delete operations, there are a few things to watch out for when working with tasks:

1. Tasks can be orphaned and belong to no projects, they can belong to one project, or they can be multi-homed across two or more projects. The memberships field is a collection of the projects with which the task is associated.
   
2. Tasks can be multi-homed as subtasks. For example, task A can be in project B and the same task A can also be a subtask of task C.

• Tasks API documentation
• Tasks in the Asana Product Guide

Projects

A project is a collection of tasks that can be viewed as a list, board, timeline, and calendar. Projects can only exist in a single organization or workplace and only belong to a single team. Projects can be public in the team or private to project members. Among the many fields associated with projects, they can have global (shared across the organization) or local (project-specific) custom fields. A project’s custom fields will be displayed on each task within the project.

• Projects API documentation
• Projects in the Asana Product Guide

Portfolios

Portfolios are collections of projects (or other portfolios). Custom fields can be added to portfolios in addition to standard fields that are displayed on every portfolio. These fields provide a high-level overview of the status of each project within the portfolio.

• Portfolios API documentation
• Portfolios in the Asana Product Guide

Sections

A section is a group of tasks within a project. Sections let you divide tasks into categories, workflow stages, priorities, and more.

• Sections API documentation
• Sections in the Asana Product Guide

Subtasks

A subtask is exactly the same as tasks in a project except that one (and only one) of its parents is a task (although subtasks can also simultaneously be organized into projects). To check if a task has a subtask, include the num_subtasks field when fetching the parent task.

Things to note when working with subtasks:

1. Subtasks do not inherit the projects of their parent tasks.
   
2. There can be up to 5 levels of subtasks below a task. We do not recommend making sub-subtasks.
3. There is no way to fetch all subtasks of all tasks in a project in a single request.

• Subtasks API documentation
• Subtasks in the Asana Product Guide

How users are organized

Workspaces

A workspace is the highest-level organizational unit in Asana. All projects, tasks, and teams have an associated workspace.

• Workspace / Organization API documentation
• Workspaces in the Asana Product Guide

Organizations

An organization is a special kind of workspace that represents a company. Organizations connect all the employees at a company using Asana in a single space based on the company’s shared email domain. In an organization, you can group your projects into teams.

• Workspace / Organization API documentation
• Organizations in the Asana Product Guide

Teams

Teams are a subset of users in an organization who collaborate on projects together. Every project in an organization is associated with one team. Team conversations are not currently available in the API.

• Teams API documentation
• Teams in the Asana Product Guide

Users

A user object represents an account in Asana that can be given access to various workspaces, projects, and tasks. Asana accounts are free and tied to individuals; Asana accounts grant access to one or more shared Workspaces and Organizations to collaborate with other Asana users.

• Users API documentation
• Users & Guests in the Asana Product Guide

Guest Users

Users can invite clients, contractors, customers, or anyone else who does not have an email address at an approved Organization email domain. These users join as Organization Guests. Guests have limited access in an Organization -- they can only see what’s explicitly shared with them.

Note: it can be advantageous to use guests to create bot accounts. Due to the access restrictions, bots created from a guest account Personal Access Token can be given fine-grained access to only the data that it needs to use.

• Users API documentation
• Users & Guests in the Asana Product Guide

Authentication

Asana supports a few methods of authenticating with the API. Simple cases are usually handled with a Personal Access Token, while multi-user apps utilize oauth.

"Authorization: Bearer ACCESS_TOKEN"

• OAuth 2.0 We require that applications designed to access the Asana API on behalf of multiple users implement OAuth 2.0.
• Personal Access Token Personal Access Tokens are designed for accessing the API from the command line or from personal applications.

OAuth

Most of the time, OAuth is the preferred method of authentication for developers, users, and Asana as a platform. If you're new to OAuth, take a moment to learn about it here. It's not as scary as you might think!

In addition to learning about how to use OAuth on the Asana platform here, feel free to take a look at the official OAuth spec!

At its core, OAuth is a mechanism for applications to access the Asana API on behalf of a user without the application having access to the username and password. Instead, apps get a token which they can use with their own application credentials to make API calls.

What is OAuth?

If you're using a library to handle this or already understand OAuth and have registered an OAuth application, you may want to skip ahead to the quick reference.

1. If you have not already, you will need to register an application. Take note of the client ID, an application's username, and the client secret, an application's password (protect it like one)!

2. A user will arrive at your application and click a button that says "Connect with Asana."

3. This takes the customer to the User Authorization Endpoint, which displays a page asking the user if they would like to grant access to your third-party application.

4. If the customer clicks "Allow", they are redirected back to the application, bringing along a special code as a query parameter. (We are assuming the Authorization Code Grant flow, which is the most common.)

5. The application can now use the Token Exchange Endpoint to exchange the code, together with the Client Secret, for a Bearer Token (which lasts an hour) and a Refresh Token (which can be used to fetch new Bearer Tokens when the current one expires).

6. The application can make requests of the API using this Bearer Token for the next hour.

7. Once the Bearer Token expires, the application can again use the Token Exchange Endpoint to exchange the Refresh Token for a new Bearer Token. (This can be repeated for as long as the user has authorized the application.)

We definitely recommend using a library to take care of the nitty-gritty of OAuth, but hopefully this helps demystify the process somewhat.

Register an Application

You must first register your application with Asana to receive a client ID and client secret. Fortunately, this process is fast and easy: visit your Account Settings dialog, click the Apps tab, and "Add New Application".

You must supply your new application with:

• App Name - A name for your application. A user will see this name when your application requests permission to access their account as well as when they review the list of apps they have authorized.
• App URL - The URL where users can access your application or, in the case of native applications, this can be a link to setup or support instructions. Note that this URL must start with "http" or "https".
• Redirect URL - As described in the OAuth specification, this is where the user will be redirected upon successful or failed authentications. Native or command line applications should use the special redirect URL urn:ietf:wg:oauth:2.0:oob. For security reasons, non-native applications must supply a "https" URL (more on this below).
• Icon - Optionally, you can upload an icon to enhance the recognizability of the application when users are authenticating.

Note that all of these attributes can be changed later, so don't worry too much right away.

Once you have created an app, the details view will include a Client ID, needed to uniquely identify your app to the Asana API, as well as a Client Secret.

Note Your Client Secret is a secret, it should never be shared with anyone or checked into source code that others could gain access to.

Quick Reference

• Applications can be created from the "Apps" tab of your account settings, where you will find your Client ID and Client Secret.
• The endpoint for user authorization is https://app.asana.com/-/oauth_authorize
• The endpoint for token exchange is https://app.asana.com/-/oauth_token
• Asana supports the Authorization Code Grant flow.
• Once an access token has been obtained your application can make calls on behalf of the user

User Authorization Endpoint

Request

Send a user to oauth_authorize

<a href="https://app.asana.com/-/oauth_authorize
?client_id=753482910
&redirect_uri=https://my.app.com
&response_type=code
&state=thisIsARandomString
&code_challenge_method=S256
&code_challenge=671608a33392cee13585063953a86d396dffd15222d83ef958f43a2804ac7fb2
&scope=default">Authenticate with Asana</a>

Your app redirects the user to https://app.asana.com/-/oauth_authorize, passing parameters along as a standard query string:

Response

If either the client_id or redirect_uri do not match, the user will simply see a plain-text error. Otherwise, all errors will be sent back to the redirect_uri specified.

The user then sees a screen giving them the opportunity to accept or reject the request for authorization. In either case, the user will be redirected back to the redirect_uri.

User is redirected to the redirect_uri

https://my.app.com?code=325797325&state=thisIsARandomString

When using the response_type=code, your app will receive the following parameters in the query string on successful authorization.

You should check that the state is the same in this response as it was in the request. You can read more about the state parameter here.

OAuth Scopes

The Asana API supports a small set of OAuth scopes you can request using the scope parameter during the user authorization step of your authentication flow. Multiple scopes can be requested at once as a space-delimited list of scopes. An exhaustive list of the supported scopes is provided here:

Token Exchange Endpoint

Request

When your app receives a code from the authorization endpoint, it can now be exchanged for a proper token.

If you have a client_secret, this request should be sent from your secure server. The browser should never see your client_secret.

App sends request to oauth_token

{
  "grant_type": "authorization_code",
  "client_id": "753482910",
  "client_secret": "6572195638271537892521",
  "redirect_uri": "https://my.app.com",
  "code": "325797325",
  "code_verifier": "fdsuiafhjbkewbfnmdxzvbuicxlhkvnemwavx"
}

Your app should make a POST request to https://app.asana.com/-/oauth_token, passing the parameters as part of a standard form-encoded post body.

The token exchange endpoint is used to exchange a code or refresh token for an access token.

Response

In the response, you will receive a JSON payload with the following parameters:

{
  "access_token": "f6ds7fdsa69ags7ag9sd5a",
  "expires_in": 3600,
  "token_type": "bearer",
  "refresh_token": "hjkl325hjkl4325hj4kl32fjds",
  "data": {
    "id": "4673218951",
    "name": "Greg Sanchez",
    "email": "gsanchez@example.com"
  }
}

Authorization Code Grant

To implement the Authorization Code Grant flow (the most typical flow for most applications), there are three steps:

1. Send the user to the authorization endpoint so that they can approve access of your app to their Asana account

2. Receive a redirect back from the authorization endpoint with a code embedded in the parameters

3. Exchange the code via the token exchange endpoint for a **refresh_token** and, for convenience, an initial access_token.

4. When the short-lived access_token expires, the **refresh_token** can be used with the token exchange endpoint, without user intervention, to get a fresh access_token.

The token that you have at the end can be used to make calls to the Asana API on the user's behalf.

Proof Key for Code Exchange (PKCE) OAuth Extension

User Authorization Endpoint

{
  ...
  "code_challenge": "671608a33392cee13585063953a86d396dffd15222d83ef958f43a2804ac7fb2",
  "code_challenge_method": "S256"
}

Token Exchange Endpoint

{
  ...
  "code_verifier": "fdsuiafhjbkewbfnmdxzvbuicxlhkvnemwavx"
}

PKCE proves the app that started the authorization flow is the same app that finishes the flow. You can read more about it here.

Here's what you need to know:

1. Whenever a user wants to oauth with Asana, your app server should generate a random string called the code_verifier. This string should be saved to the user (as every code_verifier should be unique per user). This should stay on the app server and only be sent to the Token Exchange Endpoint.

2. Your app server will hash the code_verifier with SHA256 to get a string called the code_challenge. Your server will give the browser only the code_challenge & code_challenge_method. The code_challenge_method should be the string "S256" to tell Asana we hashed with SHA256. More specifically, code_challenge = BASE64URL-ENCODE(SHA256(ASCII(code_verifier))).

3. The browser includes code_challenge & code_challenge_method when redirecting to the User Authorization Endpoint.

4. The app server should include the code_verifier in it's request to the Token Exchange Endpoint.

Asana confirms that hashing the code_verifier with the code_challenge_method results in the code_challenge. This proves to Asana the app that hit the User Authorization Endpoint is the same app that hit the Token Exchange Endpoint.

Secure Redirect Endpoint

As the redirect from the authorization endpoint in either grant procedure contains a code that is secret between Asana's authorization servers and your application, this response should not occur in plaintext over an unencrypted http connection. Because of this, we enforce the use of https redirect endpoints for application registrations.

For non-production or personal use, you may wish to check out stunnel, which can act as a proxy to receive an encrypted connection, decrypt it, and forward it on to your application. For development work, you may wish to create a self-signed SSL/TLS certificate for use with your web server; for production work we recommend purchasing a certificate from a certificate authority. A short summary of the steps for each of these processes can be read here.

Your application will need to be configured to accept SSL/TLS connections for your redirect endpoint when users become authenticated, but for many apps, this will simply require a configuration update of your application server. Instructions for Apache and Nginx can be found on their respective websites, and most popular application servers will contain documentation on how to proceed.

Personal Access Token

Personal Access Tokens (PATs) are a useful mechanism for accessing the API in scenarios where OAuth would be considered overkill, such as access from the command line and personal scripts or applications. A user can create many, but not unlimited, personal access tokens. When creating a token you must give it a description to help you remember what you created the token for.

Personal Access Tokens should be used similarly to OAuth access tokens when accessing the API, passing them in the Authorization header.

Example cURL request authenticating with a PAT

curl https://app.asana.com/api/1.0/users/me \
  -H "Authorization: Bearer ACCESS_TOKEN"

You can generate a Personal Access Token from the Asana developer console. See the Authentication Quick Start for detailed instructions on getting started with PATs.

You should regularly review the list of personal access tokens you have created and deauthorize those that you no longer need.

Remember to keep your tokens secret; treat them just like passwords! They act on your behalf when interacting with the API. Don't hardcode them into your programs. Instead, opt to use them as environment variables.

OpenID Connect

Asana also supports the OpenID Connect protocol for authenticating Asana users with your applications. This means that, in addition to the normal code and token response types for the OAuth flow, you can also use the id_token response type.

For this response type, you are not granted an access token for the API, but rather given a signed Json Web Token containing the user's ID along with some metadata. If you want to allow users to log into your services using their Asana account, the OpenID Connect protocol is an ideal way to authenticate an Asana user. To obtain an ID token, you must request the openid scope during the authentication flow.

It is also possible to obtain an ID token alongside an authorization code in the authorization code grant flow by using the (space-delimited) code id_token response type. If you do, the redirect parameters will include the ID token in addition to everything you would normally receive.

To access additional information about the user in a standardized format, we also expose a user info endpoint that can provide the user's name, email address, and profile photo. This data is available by making a GET request to https://app.asana.com/api/1.0/openid_connect/userinfo with an OAuth access token that has the openid scope. Depending on the scopes tied to that token, you will receive different pieces of data. Refer to our list of OAuth scopes to determine which additional scopes you need to get the data you want.

Metadata about our OpenID Connect implementation is also made available through OpenID Connect's discovery protocol. Making an unauthenticated GET request to https://app.asana.com/api/1.0/.well-known/openid-configuration will provide all the details of our implementation necessary for you to use OpenID Connect with Asana's API.

Errors

Missing authorization header

GET https://app.asana.com/api/1.0/users/me HTTP/1.1

HTTP/1.1 401 Not Authorized
{
  "errors": [
  {
    "message": "Not Authorized"
  }
  ]
}

Sadly, sometimes requests to the API are not successful. Failures can occur for a wide range of reasons. In all cases, the API should return an HTTP Status Code that indicates the nature of the failure (below), with a response body in JSON format containing additional information.

In the event of a server error the response body will contain an error phrase. These phrases are automatically generated using the node-asana-phrase library and can be used by Asana support to quickly look up the incident that caused the server error.

Bad request parameters

GET https://app.asana.com/api/1.0/tasks HTTP/1.1
Authorization: Bearer <personal_access_token>

HTTP/1.1 400 Bad Request
{
  "errors": [
  {
    "message": "workspace: Missing input"
  }
  ]
}

Asana had a problem

GET https://app.asana.com/api/1.0/users/me HTTP/1.1
Authorization: Bearer <personal_access_token>

HTTP/1.1 500 Server Error
{
  "errors": [
  {
    "message": "Server Error",
    "phrase": "6 sad squid snuggle softly"
  }
  ]
}

In the event of an error, the response body will contain an errors field at the top level. This contains an array of at least one error object, described below:

Rate Limits

To protect the stability of the API and keep it available to all users, Asana enforces multiple kinds of rate limiting. Requests that hit any of our rate limits will receive a 429 Too Many Requests response, which contains the standard Retry-After header indicating how many seconds the client should wait before retrying the request.

Limits are allocated per authorization token. Different tokens will have independent limits.

The client libraries respect the rate-limited responses and will wait the appropriate amount of time before automatically retrying the request, up to a configurable maximum number of retries.

Standard Rate Limits

Request

GET https://app.asana.com/api/1.0/users/me HTTP/1.1
Authorization: Bearer <personal_access_token>

Response

HTTP/1.1 429 Too Many Requests
Content-Type: application/json
Retry-After: 30

{
  "errors": [
  {
    "message": "You've made too many requests and hit a rate limit. Please retry after the given amount of time."
  }
  ]
}

Our standard rate limiter imposes a quota on how many requests can be made in a given window of time. Our limits are based on minute-long windows, and differ depending on whether the domain is premium or not. We may change these quotas or add new quotas (such as maximum requests per hour) in the future.

In addition, calls to the search API are limited to 60 requests per minute. The duplication endpoints are limited to 5 concurrent jobs.

Although the quota is defined per minute, it is evaluated more frequently than once per minute, so you may not need to wait for a full minute before retrying your request. For requests rejected by this limiter, the Retry-After header has the result of this calculation.

Requests rejected by this limiter still count against the quotas so that ignoring the Retry-After header will result in fewer and fewer requests being accepted during the subsequent tine windows.

Concurrent Request Limits

In addition to limiting the total number of requests in a given time window, we also limit the number of requests being handled at any given instant. We may change these limits or add new limits in the future.

For example, if you have 50 read requests in-flight and attempt to make another read request, the API will return a 429 Too Many Requests error. The read and write limits are independent of each other, so the number of read requests you make at one time will have no impact on the number of write requests you can make.

Responses for requests rejected by this concurrent request limiter will contain a Retry-After header specifying a duration long enough such that the other in-flight requests are guaranteed to have either completed or timed out.

Cost Limits

Objects in Asana are connected to each other in a graph. Some examples of links in this graph are:

• a task object is linked to a user object as the assignee
• a user is linked to the projects it's following
• a tag is linked to all its tasks
• a task is linked to all its subtasks
• a task is linked to all its custom field values

Depending on the kind of requests you make to our API, our servers have to traverse different parts of the graph. The sizes of these parts directly influence how expensive it is for our servers to build the API responses. For example, fetching just the name and gid of a task requires very few resources and no traversal of the graph, but fetching all tasks in a project and all their attributes (assignee, followers, custom fields, likes) can require following several thousand links in the graph.

Because there can be a wide range in the cost of any given API request in terms of the computational resources and database load, the standard rate limits are not always enough to maintain stability of the API. In the past, when we’ve received bursts of expensive requests, our typical course of action has been to block the offending authorization token and reject all future requests, resulting in confusion for both the user and the app developer. Instead, to protect against the extreme cases where API requests require inordinate traversal of the graph, we impose an additional limit based on the computational cost.

The cost we associate with a request isn't equivalent to the number of links in the subset of the graph involved, but it is roughly proportional. The cost of a request is calculated after the response has been fully built and we know how much data we needed to fetch from our databases to build it. This cost is then deducted from a quota, and the response is returned. Because the cost of a request is not known until we’ve built the response, we allow this deduction to result in a net negative quota. The request that causes the quota to become negative will receive the expected response and not be rejected.

When a request is received, if the remaining quota is not positive, the new request is rejected with a 429 Too Many Requests. As with the standard rate limits, this quota is defined per-minute but is updated on a more frequent interval. The Retry-After header will specify how long you must wait for the quota to become positive again.

The vast majority of developers will be unaffected by the cost limit, and the quota is set sufficiently high that it only affects users making requests that would compromise the stability of the API. Rather than unconditionally blocking their token from the API, this cost limiter will permit them to continue operation at a slower but safe and stable rate.

Common issues & pathological cases to avoid

• Deeply nested subtasks (i.e. working sub-subtasks, sub-sub-subtasks, etc.)
• Projects with too many tasks (i.e projects with over 1,000 tasks)
• Too many unreadable tags in a workspace
• Domains with too many projects for typeahead to work well
• Undeleted webhooks

Rich Text

Example Rich Text

<body>All these new tasks are <em>really</em> getting disorganized, so <a data-asana-gid="4168112"/> just made the new <a data-asana-gid="5732985"/> project to help keep them organized. <strong>Everyone</strong> should start using the <a data-asana-gid="6489418" data-asana-project="5732985"/> when adding new tasks there.</body>

The web product offers a number of rich formatting features when writing task notes, comments, project descriptions, and project status updates. These features include bold, italic, underlined, and monospaced text, as well as bulleted and numbered lists. Additionally, users can "@-mention" other users, tasks, projects, and many other objects within Asana to create links.

The rich text field name for an object is equivalent to it's plain text field name prefixed with html_. The following object types in Asana support rich text:

Reading rich text

Python

from lxml import etree

html_text = "<body>...</body>"
root = etree.HTML(html_text)
user_ids = root.xpath('//a[@data-asana-type="user"]/@data-asana-gid')
for user_id in user_ids:
    print(user_id)

Java

import com.jcabi.xml.XML;
import com.jcabi.xml.XMLDocument;
import java.util.List;

XML root = new XMLDocument("<body>...</body>");
List<String> userIds = root.xpath("//a[@data-asana-type=\"user\"]/@data-asana-gid");
for (String userId : userIds) {
    System.out.println(userId);
}

Javascript

var htmlText = '<body>...</body>'
var parser = new DOMParser()
var doc = parser.parseFromString(htmlText, "text/html")
var iterator = doc.evaluate(
    '//a[@data-asana-type="user"]/@data-asana-gid', doc, null, XPathResult.ORDERED_NODE_ITERATOR_TYPE)
var node = iterator.iterateNext()
while (node) {
    console.log(node.nodeValue);
    node = iterator.iterateNext();
}

Rich text in the API is formatted as an HTML fragment, which is wrapped in a root <body> tag. Rich text is guaranteed to be valid XML; there will always be a root element, all tags will be closed, balanced, and case-sensitive, and all attribute values will be quoted. The following is a list of all the tags that are currently returned by the API:

Note: This list can expand as new features are introduced to the Asana web product. Treat rich text as you would treat arbitrary HTML, and ensure that your code doesn't break when it encounters a tag not on this list.

While links are easy to understand when users view the rendered in the Asana web product, an <a> tag and its href alone are insufficient to programmatically understand what the target of the link is. This is confused further by the fact that the formats of these links are frequently ambiguous. For example, an @-mention to a user generates a link to their "My Tasks", which looks identical to a link to a normal project.

Because of this, the API will return additional attributes in <a> tags to convey meaningful information about the target. The following is a complete list of attributes we may return inside an <a> tag, in addition to the usual href:

	Attribute	Meaning
	data-asana-accessible	Boolean, representing whether or not the linked object is accessible to the current user. If the resource is inaccessible, no other data-asana-* attributes will be included in the tag.
	data-asana-dynamic	Boolean, represents if contents of the a tag is the canonical name of the object in Asana. If you want to set custom text that links to an Asana object, set data-asana-dynamic="false" when creating the tag.
	data-asana-type	The type of the referenced object. One of user, task, project, tag, conversation, project_status, team, or search.
	data-asana-gid	The GID of the referenced object. If the referenced object is a user, this is the user's GID.
	data-asana-project	If the type of the referenced object is a task, and the link references that task in a particular project, this is the GID of that project.
	data-asana-tag	If the type of the referenced object is a task, and the link references that task in a particular tag, this is the GID of that tag.

Here are some examples of how this behavior manifests:

• Suppose a user with a name of "Tim" and a user GID of "53421" is @-mentioned. This will create a link to their "My Tasks" which is a project with a GID of "56789"
  • The raw link generated in Asana will be https://app.asana.com/0/56789/list.
  • The <a> tag returned in the API will be <a href="https://app.asana.com/0/56789/list" data-asana-accessible="true" data-asana-dynamic="true" data-asana-type="user" data-asana-gid="54321">Tim</a>.
• Suppose a link to a task with name "Buy milk" and GID "1234" being viewed in a project with GID "5678" is copied from the address bar and pasted into a comment.
  • The raw link generated in Asana will be https://app.asana.com/0/5678/1234.
  • The <a> tag returned in the API will be <a href="https://app.asana.com/0/5678/1234" data-asana-accessible="true" data-asana-dynamic="true" data-asana-type="task" data-asana-gid="1234" data-asana-project="5678">Buy milk</a>
• Suppose another user @-mentions a project with GID "5678" that is private and not visible to you in the web product.
  • The raw link generated in Asana will be https://app.asana.com/0/5678/list.
  • The <a> tag returned in the API will be <a href="https://app.asana.com/0/5678/list" data-asana-accessible="false" data-asana-dynamic="true">Private Link</a>

Here's an example of what a complete rich comment might look like in the API:

<body>All these new tasks are <em>really</em> getting disorganized, so <a href="https://app.asana.com/0/4168466/list" data-asana-accessible="true" data-asana-dynamic="true" data-asana-type="user" data-asana-gid="4168112">Tim Bizzaro</a> just made the new <a href="https://app.asana.com/0/5732985/list" data-asana-accessible="true" data-asana-dynamic="true" data-asana-type="project" data-asana-gid="5732985">Work Requests</a> project to help keep them organized. <strong>Everyone</strong> should start using the <a href="https://app.asana.com/0/5732985/6489418" data-asana-accessible="true" data-asana-dynamic="true" data-asana-type="task" data-asana-gid="6489418" data-asana-project="5732985">Request template</a> when adding new tasks there.</body>

Writing rich text

When writing rich text to the API, you must provide similarly structured, valid XML. The text must be wrapped in a <body> tag, all tags must be closed, balanced, and match the case of supported tags, and attributes must be quoted. Invalid XML, as well as unsupported tags, will be rejected with a 400 Bad Request error. Only <a> tags support attributes, and any attributes on other tags will be similarly rejected.

For <a> tags specifically, to make it easier to create @-mentions through the API, we only require that you provide the GID of the object you wish to reference. If you have access to that object, the API will automatically generate the appropriate href and other attributes for you. For example, to create a link to a task with GID "123", you can send the tag <a data-asana-gid="123"/> which will then be expanded to <a href="https://app.asana.com/0/0/123/f" data-asana-accessible="true" data-asana-dynamic="true" data-asana-type="task" data-asana-gid="123">Task Name</a>. You can also generate a link to a task in a specific project or tag by including a data-asana-project or data-asana-tag attribute in the <a> tag. All other attributes, as well as the contents of the tag, are ignored.

To keep the contents of your tag and make a custom vanity link, include the property data-asana-dynamic="false" when setting the contents of the tag. You would send <a data-asana-gid="123" data-asana-dynamic="false">This is some custom text!</a> and receive <a data-asana-accessible="true" data-asana-dynamic="false" data-asana-type="task" data-asana-gid="123">This is some custom text!</a>

If you do not have access to the referenced object when you try to create a link, the API will not generate an href for you, but will instead look for an href you provide. This allows you to write back <a> tags unmodified even if you do not have access to the resource. If you do not have access to the referenced object and no href is provided, your request will be rejected with a 400 Bad Request error. Similarly, if you provide neither a GID nor a valid href, the request will be rejected with the same error.

Pagination

Paginating requests for object sets that may be large is highly recommended. For requests that will return large result sets the API may truncate the result or timeout attempting to gather the data. Pagination ensures a more reliable experience by limiting requests to a smaller number of objects at a time, ultimately getting you the results faster; should there be more results, the API will return an offset that will allow you to access the next page.

Strongly prefer paginated requests {#prefer-pagination}

For all new features in the Asana API, we're making pagination required by specifying a value for the limit parameter. Though they may return more results, our current unpaginated requests are still ultimately subject to a timeout limit, which means requests that work successfully one day may fail later due to factors such as server load and network latency.

Pagination limits provide a mechanism to specify a page size that we should always be able to serve regardless of these factors. To prevent current integrations from breaking, pagination is not enabled by default on "grandfathered" endpoints; instead, you can request paginated results by providing the optional limit parameter in your query. We will be working to deprecate requests to these endpoints in the future.

Request

curl "https://app.asana.com/api/1.0/tasks?project=1337&limit=5&offset=eyJ0eXAiOJiKV1iQLCJhbGciOiJIUzI1NiJ9" \
  -H "Authorization: Bearer <personal_access_token>"

Response

{
  "data": [
    {
      "id": 1000,
      "name": "Task 1",
      ...
    },
    ...
  ],
  "next_page": {
    "offset": "yJ0eXAiOiJKV1QiLCJhbGciOiJIRzI1NiJ9",
    "path": "/tasks?project=1337&limit=5&offset=yJ0eXAiOiJKV1QiLCJhbGciOiJIRzI1NiJ9",
    "uri": "https://app.asana.com/api/1.0/tasks?project=1337&limit=5&offset=yJ0eXAiOiJKV1QiLCJhbGciOiJIRzI1NiJ9"
  }
}

Note that all of Asana's official client libraries support pagination by default.

When making a paginated request, the API will return a number of results as specified by the limit parameter. If more results exist, then the response will contain a next_page attribute, which will include an offset, a relative path attribute, and a full uri attribute. If there are no more pages available, next_page will be null and no offset will be provided. Do note that an offset token will expire after some time, as data may have changed.

When making paginated requests you are able to page through all objects for a particular query up to 100 objects at a time. Alternatively your query will be truncated at about 1000 objects. In addition, when issuing non-paginated requests to organizations with a large number of objects queries may time out before returning. For these reasons, we recommend that you paginate all requests to the API.

This method returns paginated results for tasks from a project.

Input/Output Options

GET url params

?opt_pretty
?opt_fields=followers,assignee

PUT or POST body options

options: { 
  pretty: true,
  fields: ["followers", "assignee"]
}

In addition to providing fields and their values in a request, you may also specify options to control how your request is interpreted and how the response is generated. For GET requests, options are specified as URL parameters prefixed with opt_. For POST or PUT requests, options are specified in the body. If the body uses the application/x-www-form-urlencoded content type, then options are prefixed with opt_ just like for GET requests. If the body uses the application/json content type, then options are specified inside the top-level options object (a sibling of the data object).

?opt_fields=name,notes&opt_pretty response

HTTP/1.1 200
{
  "data": {
    "name": "Make a list",
    "notes": "Check it twice!",
    "gid": 1224
  }
}

These options can be used in combination in a single request, though some of them may conflict in their impact on the response.

SELECTING FIELDS

opt_fields nesting

"data": {                       < this
  "gid": 1001,
  "name": "Feed the cat",       < this.name
  "workspace": {                < this.workspace
    "gid": 14916,
    "name": "Shared Projects",  < this.workspace.name
  },
  "followers": [{               < this.followers
    "gid": 1234,
    "email": "tbizarro@…",      < this.followers.email
  }, {
    "gid": 5678,
    "email": "gsanchez@…",      < this.followers.email
  }]
}

Some output options allow you to reference fields of objects to include in the response. The way to specify a field is by path. A path is made up of a sequence of terms separated by the dot (.) operator. It takes the form this.a.b… where this refers to an object returned at the top level of the response, a the name of a field on a root object, b a field on a child object referred to by a, and so on.

For example, when retrieving a task or tasks, the path this.followers.email refers to the email field of all users mentioned in the followers field of the task or tasks returned. See the annotated output below:

There are also some advanced operators you can use for shorter syntax in selecting fields:

( .. | .. )

The group operator can be used in place of any whole term in a path, and will match any of a group of terms.

this.(followers|assignee).email will match the email field of the assignee object or any of the followers.

Custom External Data

Custom external data allows a client application to add app-specific metadata to Tasks in the API. The custom data includes a string gid that can be used to retrieve objects and a data blob that can store character strings.

The blob may store unicode-safe serialized data such as JSON or YAML. The external gid is capped at 1,024 characters, while data blobs are capped at 32,768 characters. Each object supporting external data can have one gid and one data blob stored with it. You can also use either or both of those fields.

The external gid field is a good choice to create a reference between a resource in Asana and another database, such as cross-referencing an Asana task with a customer record in a CRM, or a bug in a dedicated bug tracker. Since it is just a unicode string, this field can store numeric IDs as well as URIs, however, when using URIs extra care must be taken when forming queries that the parameter is escaped correctly. By assigning an external gid you can use the notation external:custom_id to reference your object anywhere that you may use the original object gid.

Note: that you will need to authenticate with Oauth, as the gid and data are app-specific, and these fields are not visible in the UI. This also means that external data set by one Oauth app will be invisible to all other Oauth apps. However, the data is visible to all users of the same app that can view the resource to which the data is attached, so this should not be used for private user data.

News and Changelog

To keep up to date on changes to the API, subscribe to Platform News in our developers forum.

To subscribe to updates:

1. Go to Platform News
2. Hit login in the top right and login with your Asana account.
3. Go back to Platform News and change the bell icon in the top right to "Watching First Post" or "Tracking".

Here are the most recent updates:

• A Problem with Webhooks & Events 2020-10-15 22:42:44.249
• Recent API Updates 2020-09-15 02:28:00.036
• June 16th webhooks and event streams outage 2020-06-18 04:48:23.438
• The problem with tags, and a solution 2020-06-16 18:51:20.152
• Vanity links are now in the API 2020-03-13 23:19:01.175

Deprecations

Communicating about breaking changes

Whenever possible, the Asana API aims to preserve backwards compatibility for its users. Apps you write on top of the API now should, in ideal situations, continue to work indefinitely. However, there are a few rare cases where breaking changes are required. For example:

• When we identify a stability threat, we may need to partially limit or entirely deprecate the culprit feature in the API.
• When making a change in a backwards compatible way results in a cluttered, brittle, and confusing interface to Asana.
• When not making a breaking change poses a security vulnerability, such as when we migrated from SSLv3 to TLS 1.0.

If a breaking change is required, the API team will provide a number of resources to help our developers get through the change:

• We will communicate early, and through a variety of channels. We recommend that you join the developers community forum to learn about changes to the API.
• We will provide a clear description of the change, how it affects your requests, and a migration plan to follow to transition through the deprecation.
• We will designate a deprecation period during which you will be able to choose between both old and new behavior from the API, allowing you to test out the change without having to put your entire app at risk.

Response header notifications

While the previously mentioned communication channels are the best place to learn about upcoming changes, the API itself will also alert you of upcoming changes. Shortly after we post communication, the API will begin sending Asana-Change headers in the responses. These headers will have two or three pieces of information:

• The unique name of the change
• A URL to our blog post describing the change
• Optionally, a flag indicating that your specific request would be affected.

This header may be present multiple times in the response if there are multiple ongoing changes. Here's an example of one of these headers:

Asana-Change: name=security_headers;info=https://asa.na/api-sh;affected=true
Asana-Change: name=other_change;info=https://asa.na/api-oc

Note: If your request is not affected, we will not claim affected=false. This is in case, during the deprecation, we detect that the change has a larger scope than initially thought. A request going from "you may be affected" to "you definitely are affected" is an acceptable update, but a request going from "you definitely are not affected" to "you definitely are affected" is not an acceptable update.

Request header options

During the deprecation period, you can test out how the API will behave by sending additional headers in your requests. Sending an Asana-Enable header including comma-separated names of features will turn those features on for that request. Sending an Asana-Disable header will do the opposite and turn those features off for that request.

If no header is specified, the default behavior will be determined by how far into the deprecation period we are:

• Before the start of the deprecation period (the "start date") the feature will be disabled, and it will not be possible to enable it.
• After the start date, the feature will be disabled by default, but you can begin choosing whether to enable or disable it.
• In roughly the middle of the deprecation period (the "activation date") the default behavior will switch and the feature will be enabled by default. You can continue to disable it with the appropriate header.
• At the end of the deprecation period (the "end date") the feature will be enabled and you will no longer be able to manually disable it.

The start, activation, and end dates will clearly be documented in our communications. These days may be pushed into the future if we discover that developers need more time to migrate their apps, but they are guaranteed to never occur sooner than documented.

These dates are arranged such that, if a developer happens to miss our communication and their app breaks when the default behavior changes on the activation date, they can begin sending the Asana-Disable header to restore the old behavior and use the remaining half of the deprecation period to make their app compatible.

Here's an example of how these headers would look:

Asana-Enable: security_headers,another_change
Asana-Disable: a_third_change

Aside from reserving the right to push the date of changes to a future date, the precise time during the activation date isn't specified. However, since the default will only affect your integration if you do not pass either the Asana-Enable or Asana-Disable headers for a particular deprecation you can ensure predictable behavior of our API for your app during the entire period, including throughout the activation date.

The way we recommend you implement these changes in your integration is this:

• Whenever you detect a new Asana-Change header, log these requests and be sure to take note that a change is coming. Recall that the info key in the header will contain a link with the details.
• Identify the nature of the upcoming deprecation and decide if your integration is sensitive to the change, paying particular attention to the cases where we return affected=true.
• If changes are necessary in your integration, test the new behavior manually by making requests with Asana-Enable set to the name of the deprecation. This should provide a clear example of the new behavior as it is implemented in our API.
• Implement the changes in your integration in such a way that it can handle the new behavior and be sure to pass the Asana-Enable header when you make requests. This will ensure that you will always get the new behavior regardless of when the default behavior changes.

At this point, your integration has been migrated to the new behavior. At any point after the end date the Asana-Enable header will be ignored by the Asana API and you can feel free to remove it. (We strongly recommend keeping it all the way through the end date in case of unforseen circumstances that cause us to temporarily reset the default behavior from the new implementation to the deprecated behavior.)

Client library support

The latest version of our official client libraries for Python, Java, PHP, and Javascript all support sending custom headers and are able to use our deprecations framework. Consult the individual libraries for how to send headers with each request.

Active deprecations

There are currently no active deprecations.