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JWT Decoder

Paste a JWT token to instantly decode the header, payload, and signature. Check expiry, view all claims, and verify token structure — no libraries, no server, 100% client-side.

Paste your JWT token

How to use

  1. Paste your JWT token into the text area above — it decodes instantly as you type.
  2. The Header shows the algorithm and token type.
  3. The Payload shows all claims — including sub, iat, exp, and any custom claims.
  4. The expiry status is checked against your local clock automatically.
  5. The Signature section is shown but not verified — verification requires the secret key.

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