🪙 Security
JWT Debugger & Decoder
Paste any JWT token to instantly decode and inspect the header, payload and claims. Checks signature algorithm, expiry (exp), issued-at (iat) and more — entirely in your browser, nothing sent to a server.
🪙 JWT Token
📋 Header
Header will appear here
📦 Payload
Payload will appear here
Privacy: Decoding happens entirely in your browser using JavaScript's
atob(). Your token is never sent to any server. However, never paste production tokens in untrusted tools — this reminder applies even here.
📖 How to Use This Tool
▼
1
Paste a JWT token (starts with eyJ...) into the input
2
Header, payload and signature decode instantly
3
Check expiry time and signing algorithm
4
Copy individual sections with the Copy buttons
📝 Examples
JWT decode
Input: eyJhbGciOiJIUzI1NiJ9...
Output: Header: {alg:HS256} Payload: {sub:123,name:John}