JWT.js

jwt.js

import { readFileSync } from 'fs';
import jose from 'node-jose';

const privateKeyPath = "./private-key.pem";

let privatekeyPem;
try {
  privatekeyPem = readFileSync(privateKeyPath);
} catch (error) {
  console.error(error.message);
  process.exit(1);
}

let decryptMethod;
const privateKeyStore = jose.JWK.createKeyStore();
privateKeyStore.add(privatekeyPem, 'pem').then((privateKey) => {
  decryptMethod = jose.JWE.createDecrypt(privateKey);
}, (reason) => {
  console.error(reason.message);
  process.exit(1);
});


async function decryptJwt(jwt) {
  try {
    const decryptedContent = await decryptMethod.decrypt(jwt);
    const payload = JSON.parse(decryptedContent.payload);
    return payload;
  } catch (error) {
    console.error(`Unable to decrypt the JWT: ${error.message}`);
    return null;
  }
}