A JSON Web Token is a compact, URL-safe token used for authentication. It has three Base64-encoded parts: header, payload, and signature.

Does this verify the signature?

This tool decodes and displays the token contents. Signature verification requires the secret key, which we never ask for.

Can I see when a token expires?

Yes — the 'exp' claim is decoded and shown as a human-readable date alongside the remaining time.

Yes — decoding happens entirely in your browser. Your token never leaves your device.

Decode and inspect JSON Web Tokens. Runs in your browser. Completely private.

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JSON Web Token

How useful is JWT Decoder?

Paste a JWT token into the input field

View the decoded header, payload, and signature

Check token expiration time and other claims

Verify the token structure without needing your secret key

Generate strong, cryptographically secure random passwords.

Generate MD5 hashes from any text input.

Generate SHA-256 hashes from any text input.

Generate random UUIDs (v4) for unique identifiers.

Generate bcrypt password hashes for secure storage.

Generate HMAC signatures for message authentication.