Free JWT Decoder — Inspect Header & Claims

Decode a three-part JWT to inspect its JSON header and claims. For debugging test tokens; signatures, expiry, issuer and audience are not verified.

Free · No AI API key required

How to use this tool

Read the header and payload of a compact JSON Web Token while debugging authentication. Decoding reveals the encoded claims; it does not prove that they are trustworthy.

  1. Paste a test JWT containing header, payload and signature segments.
  2. Run the decoder to inspect the header and claims.
  3. Use your application's verifier to check signatures and claims separately.

Example to try

Unsigned demonstration token, not a credential: eyJhbGciOiJub25lIn0.eyJzdWIiOiJkZW1vIn0.

Supported use and limits

Three-part compact JWTs only. Encrypted JWTs are unsupported. Tokens are decoded on this server, so do not submit live credentials.

Does successful decoding mean a JWT is valid?

No. The tool does not verify signatures, expiration, issuer or audience. Never use its decoded claims to authorize access. Verification belongs in your authentication system.

Free to use without an account. Submitted input is processed on our server. How Sarvam Tools works.