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JWT Decoder

Decode JSON Web Tokens (JWT) to view the header, payload, and expiration without verification.

JSON Web Tokens (JWTs) are used extensively for authentication and authorization in modern web applications. This decoder lets you paste any JWT and instantly see its header (algorithm, type) and payload (claims, user data, expiration) in readable JSON format.

Important: This tool only decodes the token — it does not verify the signature. Use it for debugging and inspection, not for security validation. Everything runs in your browser with no data sent to any server.

Decoder

Results

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How to Use

  1. Paste your JWT token into the input field
  2. Click Calculate to decode
  3. Review the header, payload, and expiration
  4. Note: This does NOT verify the signature

FAQ

Does this verify the JWT signature?

No. This tool only decodes the header and payload. It does not verify the cryptographic signature. Never trust decoded data without server-side verification.

Is my token sent to a server?

No. All decoding runs in your browser. Your token never leaves your device.

What JWT formats are supported?

Standard three-part JWTs (header.payload.signature) using Base64URL encoding.

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Learn More

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