JWT Decoder
Decode JSON Web Tokens instantly. View header, payload, expiration status, and signature information.
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How to Use This Tool
Paste a JSON Web Token into the input field and click Decode. The tool splits the token into its three parts (header, payload, signature), decodes the Base64URL-encoded header and payload, and displays them as formatted JSON. It also checks the expiration claim and shows whether the token is expired.
Common Use Cases
- Inspecting authentication tokens during API development
- Debugging OAuth 2.0 and OpenID Connect flows
- Verifying token claims and expiration before deployment
- Understanding JWT structure for security audits
Frequently Asked Questions
What is a JWT?
A JSON Web Token (JWT) is a compact, URL-safe way to represent claims between two parties. It consists of three parts separated by dots: header, payload, and signature.
Does this tool verify the JWT signature?
This tool decodes and displays the JWT contents but does not verify the signature. Signature verification requires the secret key or public key used to sign the token.
Is my token safe?
Yes. All decoding happens locally in your browser. Your JWT is never sent to any server.