Decrypt jwt

decrypt.js

import { jwtDecrypt } from 'jose';

// Your base64-encoded 256-bit key (should decode to 32 bytes)
const base64Key = 'yourBase64EncodedKeyHere'; // example: "3q2+7w==..."

// Decode base64 to a Uint8Array
const key = Uint8Array.from(Buffer.from(base64Key, 'base64'));

// Your JWE compact token
const token = 'eyJalgIjoiZGlyIiwiZW5jIjoiQTI1NkdDTSJ9..<IV>.<ciphertext>.<tag>';

async function decrypt() {
  const { payload, protectedHeader } = await jwtDecrypt(token, key);

  console.log('🔓 Decrypted payload:', new TextDecoder().decode(payload));
  console.log('📄 Header:', protectedHeader);
}

decrypt().catch(err => console.error('Decryption failed:', err));