Normalize Telephone Number

// Description
// Normalize Telephone Number
// Useful for Studio to read out telephone numbers as telephone number rather
// than large numbers

exports.handler = async function (context, event, callback) {
  // Make sure under Functions Global Config tab:
  // "Add my Twilio Credentials (ACCOUNT_SID) and (AUTH_TOKEN) to ENV"
  // is CHECKED
  const twilioClient = context.getTwilioClient();

  // Pass in From as a URL query parameter
  // Example: https://x.x.x.x/<path>?From=%2b15108675310
  const from = event.From || '+15095550100';

  const result = await twilioClient.lookups
    .phoneNumbers(from)
    .fetch({ countryCode: 'US' });

  result = {
    normalizedNum: result.nationalFormat,
  };

  return callback(null, result);
};