Example showing a simple promisified decryption of a KMS encrypted string

KMS-decrypt-example.js

const decrypt = data =>
  new Promise((resolve, reject) =>
    kms.decrypt(
      {
        CiphertextBlob: Buffer.from(data, 'base64')
      },
      (err, data) => {
        if (err) {
          reject(err);
        } else {
          resolve(data.Plaintext.toString());
        }
      }
    )
  );

decrypt(process.env.SOME_PARAMETER).then(param => {
  console.log(param);
});