Client Credentials Grant


The Client Credentials grant is used when applications request an access token to access their own resources, not on behalf of a user (for example, background services and daemons). It must be used only by confidential clients.

Basic scheme

Aidbox OAuth module support Client Credentials Grant flow in different formats. First one is in strict adherence to specification for better compatibility. Second one uses JSON request as a more modern and simple way. Read official OAuth 2.0 specification for more details.

Configure Client

To start using this flow you have to create and configure Client. The only required parameters is secret and you also have to enable this flow for client by grant_types: ['client_credentials']

create new api client
PUT /Client/api-client
secret: verysecret
- client_credentials

You can also configure token format and expiration, as well refresh token:






use access token in jwt format


int (seconds)

token expiration time from issued at



enable refresh_token

create new api client
PUT /Client/api-client
secret: verysecret
- client_credentials
access_token_expiration: 600
token_format: jwt
refresh_token: true

Since by default new client has no access to any resources, you probably want to configure AccessPolicy for this specific client:

create policy
PUT /AccessPolicy/api-client
engine: allow
- id: api-client
resourceType: Client

Get Access Token

Next step is exchange client id and secret for Access Token.

Using Basic & form-url-encoded:

POST /auth/token
Authorization: Basic base64(, client.secret)
Content-Type: application/x-www-form-urlencoded

Or by JSON request:

POST /auth/token
Content-Type: application/json
{ "grant_type": "client_credentials",
"client_id": "api-client",
"client_secret": "verysecret"

For simple client configuration you will get JSON with access_token in response:

status: 200
"token_type": "Bearer",
"access_token": "ZjQyNGFhY2EtNTY2MS00NjVjLWEzYmEtMjIwYjFkNDI5Yjhi"

For JWT with refresh token you will get something like this:

status: 200
"token_type": "Bearer",
"expires_in": 3000,
"access_token": "eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJodHRwOi8vbG9jYWxob3N0OjgwODEiLCJzdWIiOiJhdXRoLWNsaWVudCIsImlhdCI6MTU1NDQ3MDA3NCwianRpIjoiOWJlMTY1YzMtOTQzZS00NGU0LTkxMWEtYzk1OGY3MWRhMTdkIiwiYXVkIjoiaHR0cDovL3Jlc291cmNlLnNlcnZlci5jb20iLCJleHAiOjE1NTQ0NzMwNzR9.cR9N1Z-pKidENTrtYu5aVADRzAigZM6RvoFAzbeLkBecRcY03j4VVXnqRG1yJo744FvJ0qfetHQ2JTSQFxLrtQ",
"refresh_token": "eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJodHRwOi8vbG9jYWxob3N0OjgwODEiLCJzdWIiOiJhdXRoLWNsaWVudCIsImp0aSI6IjliZTE2NWMzLTk0M2UtNDRlNC05MTFhLWM5NThmNzFkYTE3ZCIsInR5cCI6InJlZnJlc2gifQ.lsxtjkW0MVku4lh1W-vOEz-4wJjRN-Dkmbt2NpjezPAGj-z7FBGVyKVfH8Q0nY0smuvUnkXEAxajIb_zZdXQtw"


If you use JWT token format and provide in token request additional parameter audience, resulting token will set aud claim into value you've sent.

The "aud" (audience) claim identifies the recipients that the JWT is
intended for. Each principal intended to process the JWT MUST
identify itself with a value in the audience claim. If the principal
processing the claim does not identify itself with a value in the
"aud" claim when this claim is present, then the JWT MUST be
rejected. In the general case, the "aud" value is an array of case-
sensitive strings, each containing a StringOrURI value. In the
special case when the JWT has one audience, the "aud" value MAY be a
single case-sensitive string containing a StringOrURI value. The
interpretation of audience values is generally application specific.

Using Access Token

You can use access token in Authorization header for Aidbox API calls:

GET /Patient
Authorization: Bearer ZjQyNGFhY2EtNTY2MS00NjVjLWEzYmEtMjIwYjFkNDI5Yjhi
curl -H 'Authorization: Bearer ZjQyNGFhY2EtNTY2MS00NjVjLWEzYmEtMjIwYjFkNDI5Yjhi' /Patient

Revoke Access Token (Close Session)

Aidbox create Session (resource) for each Access Token, which can be closed with special endpoint DELETE /Session with token in Authorization header:

DELETE /Session
Authorization: Bearer ZjQyNGFhY2EtNTY2MS00NjVjLWEzYmEtMjIwYjFkNDI5Yjhi

Session is just Resource and you can inspect and manipulate with sessions by standard Search & CRUD API for example get all sessions - GET /Session

Auth Sandbox