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JWT Decoder

Decode JWT tokens instantly. View color-coded header, payload, and signature. Check expiration, inspect registered claims, and analyze token structure.

FreeNo SignupNo Server UploadsZero Tracking

How to Use JWT Decoder

  1. 1

    Paste your JWT

    Paste a JSON Web Token into the input field. The token should have three parts separated by dots.

  2. 2

    View decoded parts

    See the header (blue), payload (purple), and signature (green) decoded and formatted as JSON.

  3. 3

    Check claims

    Review all standard JWT claims with descriptions, and see if the token is expired or still valid.

Frequently Asked Questions

Yes. This tool runs 100% in your browser. Your token is never sent to any server. However, never paste production tokens with sensitive data into untrusted tools.

No. Signature verification requires the secret key or public key, which this tool does not collect. This is a decode-only tool for inspecting token contents.

A JWT has three base64url-encoded parts separated by dots: the Header (algorithm and token type), the Payload (claims/data), and the Signature (cryptographic verification).

The 'exp' claim is the expiration time as a Unix timestamp. After this time, the token should no longer be accepted. This tool automatically checks if your token is expired.

Standard JWTs (JWS) are signed but not encrypted. Anyone can decode the payload. Never put sensitive data in a JWT unless you use JWE (JSON Web Encryption).