ID token claims

An ID token is a JSON Web Token (JWT) containing cryptographically signed claims about a user’s profile information. Scalekit issues this token after successful authentication. The ID token is a Base64-encoded JSON object with three parts: header, payload, and signature.

Here’s an example of the payload. Note this is formatted for readability and the header and signature fields are skipped.

Sample IdToken payload

{
  "iss": "https://yoursaas.scalekit.com",
  "azp": "skc_12205605011849527",
  "aud": ["skc_12205605011849527"],
  "amr": ["conn_17576372041941092"],
  "sub": "conn_17576372041941092;google-oauth2|104630259163176101050",
  "at_hash": "HK6E_P6Dh8Y93mRNtsDB1Q",
  "c_hash": "HK6E_P6Dh8Y93mRNtsDB1Q",
  "iat": 1353601026,
  "exp": 1353604926,
  "name": "John Doe",
  "given_name": "John",
  "family_name": "Doe",
  "picture": "https://lh3.googleusercontent.com/a/ACg8ocKNE4TZj2kyLOj094kie_gDlUyU7JCZtbaiEma17URCEf=s96-c",
  "locale": "en",
  "email": "john.doe@acmecorp.com",
  "email_verified": true
}

Full list of ID token claims

Claim	Presence	Description
aud	Always	Intended audience (client ID)
amr	Always	Authentication method reference values
exp	Always	Expiration time (Unix timestamp)
iat	Always	Issuance time (Unix timestamp)
iss	Always	Issuer identifier (Scalekit environment URL)
oid	Always	Organization ID of the user
sub	Always	Subject identifier for the user
at_hash	Always	Access token hash
c_hash	Always	Authorization code hash
azp	Always	Authorized presenter (usually same as aud)
email	Always	User’s email address
email_verified	Optional	Email verification status
name	Optional	User’s full name
family_name	Optional	User’s surname or last name
given_name	Optional	User’s given name or first name
locale	Optional	User’s locale (BCP 47 language tag)
picture	Optional	URL of user’s profile picture

Verifying the ID token

In some cases, you may need to parse the ID token manually—for example, to access custom claims that are not part of the standard User object in the SDK method. These details are encoded in the ID token as JSON Web Token (JWT).

To verify the signature, you need to:

1. Fetch the public signing keys from the JSON Web Key Set (JWKS) endpoint.
2. Use a JWT library for your language to decode and verify the token using the keys.

The JWKS endpoint for your environment is located at:

https://<YOUR_ENVIRONMENT_URL>/keys

For example, if your Scalekit Environment URL is https://your-environment.scalekit.com, the keys can be found at https://your-environment.scalekit.com/keys.

Important claims

When validating, pay attention to these claims:

• iss (Issuer): This must match your Scalekit environment URL.
• aud (Audience): This must match your application’s client ID.
• exp (Expiration Time): Ensure the token has not expired.
• sub (Subject): This uniquely identifies the user, often combining the connection_id and the identity provider’s unique user ID.
• amr: Contains the connection_id used for authentication.

This structure provides a neutral, factual reference for ID token claims in Scalekit, organized according to the data structure itself.

An ID token is a cryptographically signed Base64-encoded JSON object containing name/value pairs about the user’s profile information. It is a JWT token. Validate an ID token before using it. Since you communicate directly with Scalekit over HTTPS and use your client secret to exchange the code for the ID token, you can be confident that the token comes from Scalekit and is valid.

If you use the Scalekit SDK to exchange the code for the ID token, the SDK automatically decodes the base64url-encoded values, parses the JSON, validates the JWT, and accesses the claims within the ID token.