JWT Decoder & Debugger
Decode a JWT — header, payload, claim times. Never sent.
Token
About this tool
A JWT (JSON Web Token) is a compact, URL-safe way to represent claims between two parties. This tool decodes the three parts (header, payload, signature) and renders timestamps in human form so you can inspect exp, iat, nbf etc. without ever sending the token anywhere.
Common use cases
- Debug authentication tokens from your apps or APIs
- Inspect claims and expiration without risking secret leakage
- Quickly read sub, roles, or custom claims during development
Notes
Signature verification is intentionally omitted — this is a decoder only. Never paste production secrets into untrusted online tools.
Further reading
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