JWT Decoder
Decode JSON Web Tokens to inspect header, payload, and check expiration. Runs entirely in your browser (decode-only, no signature verification).
JWT Token
This tool decodes token data for inspection only. Signature and issuer trust are not validated.
How To Use
- Paste a full JWT token in header.payload.signature format.
- Click Decode to inspect header and payload claims instantly.
- Check expiry status and verify signature separately in your auth stack before trusting the token.
Common Use Cases
- Debugging expired auth tokens in frontend login flows.
- Validating role and subject claims during API testing.
- Inspecting third-party identity provider payloads safely.
How To Use & FAQ
Q: Can this tool verify the JWT signature?
A: No. It decodes token parts for inspection only and does not validate secrets or public keys.
Q: Does this upload my token data?
A: No. Decoding happens locally in your browser session.
Q: Does this support UTF-8 claims (e.g. Korean, emoji)?
A: Yes. Base64url token segments are decoded with UTF-8 support for readable claim values.
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