How to Safely Inspect and Validate JWT Claims and Expiration
Decode JSON Web Tokens (JWT), verify header algorithms, inspect payload claims, and check expiration status without leaking keys.
JSON Web Tokens (JWT) are widely used for stateless authentication and authorization across modern microservices. A JWT token consists of three Base64URL-encoded segments separated by dots: Header, Payload, and Signature.
Key Claims to Inspect: - exp (Expiration Time): Verifies if the session token is still valid or expired. - iat (Issued At): When the token was originally signed. - sub (Subject): The user ID or entity identifier. - roles / permissions: Authorization scopes granted to the client.
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