JWT Debugger
Decode and debug JSON Web Tokens (JWT) directly in your browser. Client-side only, secure and fast.
Decode, inspect, and verify JWT tokens directly in your browser. Check headers, payloads, and signatures without sending sensitive tokens to any server.
JWT Debugger
Decode and debug JSON Web Tokens (JWT) directly in your browser. Client-side only, secure and fast.
About this tool
Decode, inspect, and verify JWT tokens directly in your browser. Check headers, payloads, and signatures without sending sensitive tokens to any server.
Enter your JWT string to decode.
Output appears here...
Header
"root"
:
{}0 ItemsPayload
"root"
:
{}0 ItemsEnter your JWT string to decode.
FAQ
Common questions and answers about this topic.
What is a JWT?
JSON Web Token, a compact URL-safe format for securely transmitting claims between parties. It consists of a header, payload, and signature.
What parts are decoded?
The header and payload are Base64-decoded and displayed as formatted JSON. The signature is shown separately.
Can this verify signatures?
This debugger decodes and displays the token structure. For signature verification, you would need the secret key or public key.
Is my data sent to any server?
No, JWT debugging runs entirely in your browser. Your token is parsed and decoded locally with JavaScript and never transmitted anywhere.