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Savvy Goose

JWT Decoder

Inspect a JSON Web Token's header and payload. No signature verification.

Token
Anatomy of a JWT

A JWT is three Base64url-encoded segments joined by dots:

header.payload.signature

  • Header: algorithm & token type.
  • Payload: the claims (who, what, when).
  • Signature: proves the token wasn't tampered with.

This tool only decodes. It doesn't verify the signature. Decoding requires no secret; verifying does.

Decoding only. We never verify the signature. Anyone holding the secret could mint a token that decodes the same way.
Header
Payload
Signature

Share
The URL below carries the token. Be careful — anyone with the URL sees the token.

Token is too long to include in the URL.

Share URL

How to use the JWT Decoder

  1. Paste a JWT.
  2. See the decoded header and payload, plus expiry status.

Frequently asked questions

Does this verify the signature?
No, it only decodes the token. Verifying the signature needs the issuer's key.
Are tokens uploaded?
No. Decoding happens locally, so it's safe to paste sensitive tokens.

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