Decode a JWT token (no verification)
{ } EncodeDecode a JWT to inspect header and payload
$ echo "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODk..." | jwt-decode(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}`;
}
}