JWT Decoder
Free online JWT decoder. Inspect header, payload and expiry of JSON Web Tokens — decoding only, no secrets required, nothing transmitted.
FAQ
Does decoding verify the signature?
No — use the companion JWT Signer & Verifier tool (jwt-signer) to check HS256/384/512 signatures with your secret. This tool decodes for inspection only.
Is it safe to paste tokens here?
Decoding is local-only. Still, never paste production tokens from active sessions into any tool.
What does exp mean?
The expiration timestamp — the tool shows it as a readable date and flags expired tokens.