JWT Decoder
Decode and inspect JSON Web Tokens (JWT) instantly. View header, payload, and signature without verification.
Instant Decoding
Decode JWT header and payload from Base64 encoding.
Structured View
Display header, payload, and signature separately with formatted JSON.
Client-Side Only
All decoding happens locally in your browser—no server requests.
How to use
- Paste a JWT token into the JWT Token area.
- Click Decode.
- View the decoded Header, Payload, and Signature.
- Use the Copy buttons to copy individual sections.
FAQ
- What is a JWT?
- A JSON Web Token is a compact, URL-safe token format for securely transmitting information between parties.
- Is this secure?
- This tool only decodes the JWT—it does not verify the signature. Always verify JWTs server-side.
- What are the three parts of a JWT?
- Header (algorithm and token type), Payload (claims/data), and Signature (cryptographic verification).