test.js

// You can use this file to test the server-sdk
const { Vonage } = require('@vonage/server-sdk')
const { tokenGenerate } = require('@vonage/jwt');
const { readFileSync } = require('fs');

const VONAGE_API_KEY = process.env.VONAGE_API_KEY
const VONAGE_API_SECRET = process.env.VONAGE_API_SECRET

const appId = '<application id>';
const privateKey = readFileSync(`${__dirname}/private.key`);

const vonage = new Vonage({
  apiKey: VONAGE_API_KEY,
  apiSecret: VONAGE_API_SECRET,
  privateKey: privateKey,
});

// Change what you need below this line

// this is called an  IIFE (Immediately Invoked Function Expression)
// It allows async functions to be called until node gets top level async
(async () => {
  const to = '<to number>';
  const from = '<from number>';
  const text = 'Time is an illusion. Lunch time doubly so';

  try {
    const res = await vonage.sms.send({
      from, 
      to,
      text,
      clientRef: 'local-client',
    });

    console.log(res);

  } catch (error) {
    console.error(error);
  }
})()