Decode and Verify the Signature of a Cognito JSON Web Key Token
After a user logs in, an Amazon Cognito user pool returns a JWT, which is a Base64-encoded JSON string that contains information about the user (called claims). Amazon Cognito returns three tokens: the ID token, the access token, and the refresh token. The ID token contains the user fields defined in the Amazon Cognito user pool.
Tokens include three sections: a header, a payload, and a signature.
The following is the header of a sample ID token. The header contains the key ID ("kid"), as well as the algorithm ("alg") used to sign the token. In this example, the algorithm is "RS256", which is an RSA signature with SHA-256.
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