Using tokens with user pools
Authenticate users and grant access to resources with tokens. The claims in tokens are information about your user. The ID token contains claims
about their identity, like their username, family name, and email address. The access token
contains claims like scope that the authenticated user can use to access
third-party APIs, Amazon Cognito user self-service API operations, and the UserInfo endpoint. The access and ID tokens both
include a cognito:groups claim that contains your user's group membership in your
user pool. For more information about user pool groups, see Adding groups to a user pool.
Amazon Cognito also has tokens that you can use to get new tokens or revoke existing tokens. Refresh a token to retrieve a new ID and access tokens. Revoke a token to revoke user access that is allowed by refresh tokens.
Amazon Cognito issues tokens as Base64-encoded strings. You can decode any Amazon Cognito ID or access token from base64 to plaintext JSON. Amazon Cognito refresh tokens are encrypted, and can't be read by Amazon Cognito administrators or users.
Authenticating with tokens
When a user signs into your app, Amazon Cognito verifies the login information. If the login is successful, Amazon Cognito creates a session and returns an ID, access, and refresh token for the authenticated user. You can use the tokens to grant your users access to your own server-side resources or to the Amazon API Gateway. Or you can exchange them for temporary AWS credentials to access other AWS services.
Storing tokens
Your app must be able to store tokens of varying sizes. Token size can change for reasons
including, but not limited to, additional claims, changes in encoding algorithms, and changes
in encryption algorithms. When you enable token revocation in your user pool, Amazon Cognito adds
additional claims to JSON Web Tokens, increasing their size. The new claims
origin_jti and jti are added to access and ID tokens. For more
information about token revocation, see Revoking
tokens.
Important
Best practice is to secure all tokens in transit and storage in the context of your application. Tokens can contain personally identifying information about your users, and information about the security model that you use for your user pool.
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