DEVELOPER
JWT Decoder & Inspector
Decode JWT header and payload, check expiry, and inspect claims instantly.
This tool only decodes — it does not verify the signature. Never paste tokens from systems you don't trust into any online tool.
Free JWT Decoder & Inspector
A JSON Web Token (JWT) is a compact way to send signed claims between systems. This decoder splits a token into its header, payload, and signature so you can inspect claims like expiry, issuer, and audience.
This tool is for debugging and learning only. It never verifies whether a token signature is trustworthy.
How to use
- Paste a JWT into the input field.
- Review the decoded header and payload.
- Check standard time-based claims like exp, iat, and nbf.
Frequently Asked Questions
- Is my token uploaded anywhere?
- No. Decoding happens entirely in your browser. The token is never sent to a server.
- Does this verify my JWT signature?
- No. Signature verification requires the issuer's secret or public key. This tool only base64-decodes the header and payload for inspection.
- Why should I be careful pasting JWTs online?
- JWTs can contain sensitive session data. Only decode tokens you are comfortable exposing locally, and never paste production credentials into untrusted tools.