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JWT Decoder & Generator

Decode, verify and generate JSON Web Tokens with readable, color-coded output.

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Built with privacy in mind. All processing happens entirely in your browser using open-source libraries.

What is the JWT Decoder & Generator?

A JSON Web Token (JWT) is a compact, signed token that carries claims between systems. This tool splits any JWT into its header, payload and signature, decodes the Base64-encoded JSON, and color-codes every part so you can read the token instantly instead of squinting at a single line of characters.

Because everything runs locally in your browser, sensitive tokens never leave your device. exp and iat timestamps are converted automatically to your local time, and the built-in generator creates HMAC-SHA256 tokens so you can test your integration end to end.

How to use the JWT Decoder & Generator?

  1. Paste a JWT into the input box.
  2. Click Decode Token to see the color-highlighted header, payload and signature.
  3. Switch to the Generate tab, enter a JSON payload and a secret, then click Generate Token.

Frequently Asked Questions (FAQ)

Is the JWT Decoder free?

Yes, free with no signup or limits.

Are my tokens uploaded anywhere?

No. Decoding and generation happen entirely in your browser.

Does the generator sign tokens?

Yes, it creates HMAC-SHA256 (HS256) signatures using the Web Crypto API.