JWT Decoder

Decode and verify JWT tokens

About this tool

JWT Decoder shows header and payload claims from a JSON Web Token. Inspect exp, sub, and custom claims while debugging auth — decoding is local (verification depends on options).

How to use

  1. Paste the JWT string.
  2. Inspect decoded header and payload claims.
  3. Check expiry and audience fields when present.
  4. Never paste production secrets into public tools you do not trust — this one runs locally.

FAQ

Does decoding verify the signature?

Decoding shows claims. Cryptographic verification needs the correct secret or public key when that option is available.

Is it safe to paste tokens?

Avoid pasting live production tokens into any online tool. This decoder runs in your browser and does not upload to ThothBox.

What is a JWT?

A compact token format with a header, payload, and signature used in many auth systems.

What does JWT Decoder do?

JWT Decoder shows header and payload claims from a JSON Web Token.

How do I use JWT Decoder?

Open the JWT Decoder tool, then paste the JWT string.

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