JWT Decoder Online
Decode any JSON Web Token (JWT) instantly. View the header algorithm, payload claims (exp, iat, sub), and validate structure - all in your browser, no data sent to any server.
JWT Decoder & Debugger
-Parse JSON Web Tokens, inspect claims, and scan for common security vulnerabilities
Auto-Extract from Terminal
You can copy entire terminal commands, shell scripts, or cURL requests containing a JWT and paste them directly. The tool will automatically detect and extract the token.
cURL / Bash
curl -H "Authorization: Bearer eyJhbG..." PowerShell
"Authorization" = "Bearer eyJhbG..." Windows CMD
set JWT=eyJhbG... 100% Client-Side & Secure: Your token is parsed entirely within your browser. We never send, store, or log your tokens or secrets on any server. Sharing links store configurations inside the URL hash, keeping your token client-side only.
Real-time Security Warnings
Paste a JWT token to scan its header and payload for known security weaknesses.
JWT Signature Verification
Paste JWT and enter secret to verify
Header (Algorithm & Token Type)
// Paste a token to inspect... Payload (Claims & Metadata)
// Paste a token to inspect...What is a JWT Token?
A JSON Web Token (JWT) is a compact, URL-safe token format used
for authentication and information exchange. It consists of three
Base64URL-encoded parts separated by dots: header.payload.signature.
How to Decode a JWT
- Paste your JWT token into the input field above
- The decoder instantly splits and Base64URL-decodes each part
- View header (algorithm, token type), payload (claims), and signature
-
Check expiry time (
exp) and issued-at (iat) in human-readable format
Common JWT Claims
iss Issuer
sub Subject
aud Audience
exp Expiration time
iat Issued at
jti JWT ID