JWT Decoder
Decode JSON Web Tokens (JWT) to view their header and payload.
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About JWT Decoder
Decode and analyze JSON Web Tokens (JWT) instantly and securely. This tool allows developers to inspect the header, payload, and signature components of a JWT without needing a secret key or exposing sensitive data to a server.
How to Use
- Paste your encoded JWT into the token input field.
- The tool will automatically parse the string into its component parts.
- Review the Header and Payload sections for decoded JSON data.
- Use the 'Copy' buttons to save individual sections for debugging.
Common Use Cases
- Checking the expiration (exp) and issued-at (iat) timestamps of a token.
- Verifying user claims and roles embedded in a payload.
- Debugging authentication flows in web and mobile applications.
Technical Details
Implements the standardized JWT decoding logic locally using JavaScript. Supports JWS (signed tokens) and displays raw JSON structures for easy inspection.
Frequently Asked Questions
- Can I verify the signature here?
- This is a decoder, not a validator. Signature verification requires your private/public key, which we do not ask for to ensure your security.
- Is my token safe?
- Yes. Decoding happens 100% client-side. Your token never leaves your browser.
100% Private & Secure
This tool runs entirely in your browser using client-side technology. Your files and data are never sent to a server, ensuring 100% privacy and speed.