jwt-decode Decode a JWT token (no verification)
Examples
Decode a JWT to inspect header and payload
Usage
"eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODk..." | jwt-decodeDebug an expired token from a customer support ticket
Usage
"eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJhdXRoLmV4YW1..." | jwt-decodeVerify user claims in a JWT from a staging environment
Usage
"eyJhbGciOiJIUzI1NiJ9.eyJ1c2VyIjoiYm9iIiwidGVhbSI6ImVuZ2luZWV..." | jwt-decodeView source
(input)=>{
try {
const parts = input.trim().split(".");
if (parts.length < 2) return "Error: not a valid JWT";
const header = JSON.parse(atob(parts[0].replace(/-/g, "+").replace(/_/g, "/")));
const payload = JSON.parse(atob(parts[1].replace(/-/g, "+").replace(/_/g, "/")));
return JSON.stringify({
header,
payload
}, null, 2);
} catch (e) {
return `Error: ${e.message}`;
}
}