apps API methods

Register client applications that can be used to obtain OAuth tokens.

Create an application 

POST /api/v1/apps HTTP/1.1

Create a new application to obtain OAuth2 credentials.

In Mastodon prior to 4.3, OAuth Applications could be “vacuumed” and removed from the database under certain conditions, meaning your Application’s client_id and client_secret would not be recognised by the Mastodon server.
This automated removal of applications was removed in Mastodon 4.3

A workaround for Mastodon versions older than 4.3 was to register your application, and then immediately request a Client Credential token, which would permanently ensure your application always had an active access token and would not be removed.
At present, Mastodon only supports provisioning confidential clients, i.e., you will always receive a client_secret and client_secret_expires_at attributes in the CredentialApplication entity.

For more information see: OAuth 2 client types

Returns: CredentialApplication
OAuth: Public
Version history:
0.0.0 - added
2.7.2 - now returns vapid_key
4.3.0 - deprecated vapid_key, please see api/v2/instance
4.3.0 - added support for multiple redirect_uris in Form data parameters
4.3.0 - added redirect_uris response property
4.3.0 - deprecated redirect_uri response property, since this can be a non-URI if multiple redirect_uris are registered, use redirect_uris instead
4.3.0 - changed entity type from Application to CredentialApplication

Request

Example request:

POST /api/v1/apps HTTP/1.1
Content-Type: application/json

{
  "client_name": "Test Application",
  "redirect_uris": ["https://app.example/callback", "https://app.example/register"],
  "scopes": "read write push",
  "website": "https://app.example"
}
Form data parameters
client_name
required String. A name for your application
redirect_uris
required String or Array of Strings. Where the user should be redirected after authorization. To display the authorization code to the user instead of redirecting to a web page, use urn:ietf:wg:oauth:2.0:oob in this parameter.
scopes
String. Space separated list of scopes. If none is provided, defaults to read. See OAuth Scopes for a list of possible scopes.
website
String. A URL to the homepage of your app

Response

200: OK

Store the client_id and client_secret in your cache, as these will be used to obtain OAuth tokens.

Treat the client_id and client_secret properties as if they are passwords. We recommend you encrypt these when storing in your cache, to prevent credential exposure.
{
  "id": "563419",
  "name": "Test Application",
  "website": "https://app.example",
  "scopes": ["read", "write", "push"],
  "redirect_uri": "urn:ietf:wg:oauth:2.0:oob",
  "redirect_uris": ["urn:ietf:wg:oauth:2.0:oob"],
  "client_id": "TWhM-tNSuncnqN7DBJmoyeLnk6K3iJJ71KKXxgL1hPM",
  "client_secret": "ZEaFUFmF0umgBX1qKJDjaU99Q31lDkOU8NutzTOoliw"
}

Or with multiple redirect URIs:

{
  "id": "563419",
  "name": "Test Application",
  "website": "https://app.example",
  "scopes": ["read", "write", "push"],
  "redirect_uri": "https://app.example/callback\nhttps://app.example/register",
  "redirect_uris": [
    "https://app.example/callback",
    "https://app.example/register"
  ],
  "client_id": "TWhM-tNSuncnqN7DBJmoyeLnk6K3iJJ71KKXxgL1hPM",
  "client_secret": "ZEaFUFmF0umgBX1qKJDjaU99Q31lDkOU8NutzTOoliw"
}
The redirect_uri property in the above examples is considered deprecated as of 4.3.0 and should not be used, instead use the redirect_uris property.
422: Unprocessable entity

If a required parameter is missing or improperly formatted, the request will fail.

{
  "error": "Validation failed: Redirect URI must be an absolute URI."
}

Verify your app works 

GET /api/v1/apps/verify_credentials HTTP/1.1

Confirm that the app’s OAuth2 credentials work.

Returns: Application
OAuth: App token
Version history:
2.0.0 - added
2.7.2 - now returns vapid_key
4.3.0 - deprecated vapid_key, please see api/v2/instance
4.3.0 - removed needing read scope to access this API, now any valid App token can be used
4.3.0 - added scopes and redirect_uris properties

Request

Headers
Authorization
required Provide this header with Bearer <app_token> to gain authorized access to this API method. <app_token> may be either a client_credential or access_token returned from /oauth/token

Response

200: OK

If the Authorization header was provided with a valid token, you should see your app returned as an Application entity.

{
  "name": "Test Application",
  "website": "https://app.example",
  "scopes": ["read", "write", "push"],
  "redirect_uris": [
    "https://app.example/callback",
    "https://app.example/register"
  ]
}
401: Unauthorized

If the Authorization header contains an invalid token, is malformed, or is not present, an error will be returned indicating an authorization failure.

{
  "error": "The access token is invalid"
}

See also

app/controllers/api/v1/apps_controller.rb
app/controllers/api/v1/apps/credentials_controller.rb

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