How to Decode JWT Tokens
DevToolDock Team
What is a JWT?
A JWT is a signed token with three Base64url parts: header, payload, and signature. It is used for authentication and passing claims between services.
Why decode JWTs?
Decoding lets you inspect the header (algorithm, type) and payload (claims like user id, expiry) without verifying the signature. Useful for debugging and understanding token contents.
Decode safely online
Use our JWT Decoder to paste a token and see the decoded header and payload. Never paste production secrets—decode only in trusted environments. For generating test tokens, try the JWT Generator.