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cferdinandi/parse-jwt.html Secret

Created July 5, 2023 18:02
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parse-jwt.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Parse JWT</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
</head>
<body>
<script>
/**
* Decode a JWT payload
* https://stackoverflow.com/a/38552302
* @param {String} token The JWT
* @return {Object} The decoded payload
*/
function parseJWT (token) {
let base64Url = token.split('.')[1];
let base64 = base64Url.replace(/-/g, '+').replace(/_/g, '/');
let jsonPayload = decodeURIComponent(atob(base64).split('').map(function(c) {
return '%' + ('00' + c.charCodeAt(0).toString(16)).slice(-2);
}).join(''));
return JSON.parse(jsonPayload);
}
// The JWT
let token = 'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c';
// The payload
let payload = parseJWT(token);
console.log(payload);
</script>
</body>
</html>
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