JWT Decoder
Decode JSON Web Tokens (JWT) to inspect header and payload data without verification.
Header
Payload
How to Use
Paste your JWT token in the input field. The decoded header and payload will display in real-time with formatted JSON.
Frequently Asked Questions
A JSON Web Token (JWT) is a compact, URL-safe token format used for securely transmitting information between parties. It consists of three parts: header, payload, and signature.
No, this tool only decodes the header and payload. It does not verify the cryptographic signature. Never trust a JWT's contents without proper server-side verification.
Yes, all processing is done client-side in your browser. Your token is never sent to any server. However, avoid sharing JWTs in public as they may contain sensitive claims.