How to Use the Email Verification API with Node.js

Follow the steps below to integrate your email verification API with Node.js and verify a list of email addresses.

NodeJs Script (mailtester.cjs)

	
// A simple Node JS Script to use MailTester Ninja API
// Save this to mailtester.cjs

/*
 * Installation and Setup Guide for Node.js, PM2, and PM2 Logrotate
 * ================================================================
 *
 * 1. Install Node.js
 * ------------------
 * Windows:
 * - Download the installer from the official website: https://nodejs.org/
 * - Run the installer and follow the setup wizard.
 * - Verify installation: open a terminal and type `node -v` and `npm -v`.
 *
 * Linux:
 * - Update package lists: `sudo apt update` (for Debian/Ubuntu-based systems).
 * - Install Node.js via package manager:
 *   Option 1 (NodeSource):
 *     - Add NodeSource: `curl -fsSL https://deb.nodesource.com/setup_16.x | sudo -E bash -`
 *     - Install: `sudo apt install -y nodejs`
 *   Option 2 (nvm):
 *     - Install nvm: `curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.39.1/install.sh | bash`
 *     - Load nvm: `source ~/.bashrc`
 *     - Install Node.js: `nvm install --lts`
 * - Verify installation: `node -v` and `npm -v`.
 *
 * 2. Install PM2
 * --------------
 * - Globally install PM2 using npm: `npm install -g pm2`
 * - Verify PM2 installation: `pm2 -v`
 *
 * 3. Install PM2 Logrotate
 * ------------------------
 * - Install the logrotate module: `pm2 install pm2-logrotate`
 * - Configure logrotate:
 *   - Adjust settings: `pm2 set pm2-logrotate:max_size 10M` (rotate logs when they exceed 10MB).
 *   - Set retention: `pm2 set pm2-logrotate:retain 30` (keep logs for 30 days).
 *
 * 4. Start your Nodejs Script
 * -------------------------
 * - Navigate to your project directory: `cd /path/to/your/project`
 * - Save this code to mailtester.cjs and set your key in the code.
 * - Run `npm install` this will install all dependencies (csv writer, axos, fs etc.)
 * - Start the script with PM2: `pm2 start mailtester.cjs`
 * - View running processes: `pm2 list`
 * - Save the PM2 process list to restart it on reboot: `pm2 save`
 *
 * 5. Enable PM2 Startup on System Boot
 * ------------------------------------
 * Windows:
 * - PM2 does not have native startup scripts for Windows.
 * Linux:
 * - Generate and enable a startup script:
 *   `pm2 startup systemd`
 *   - Follow the instructions provided to complete the setup.
 *
 * 6. View Logs
 * ------------
 * - Display logs in real time: `pm2 logs`
 * - View logs for a specific process: `pm2 logs `
 *
 * Notes:
 * - PM2 log files are stored by default in `~/.pm2/logs/`.
 * - Use `pm2 flush` to clear all logs.
 *
 * 7. Stop or Delete a Process
 * ---------------------------
 * - Stop a process: `pm2 stop `
 * - Delete a process: `pm2 delete `
 */


const fs = require('fs');
const axios = require('axios');

const filePath1 = './mails.txt';  // Input Path
const filePath2 = './output.csv'; // Output Path

// Your Unlimited acces key
const key = 'Your key without {}';

const { createObjectCsvWriter } = require('csv-writer');

// CSV Path
const csvFilePath = './output.csv';

// CSV Writer Setup
const csvWriter = createObjectCsvWriter({
    path: csvFilePath,    
    header: [
      { id: 'email', title: 'Email' },
      { id: 'code', title: 'Code' },
      { id: 'message', title: 'Message' },
      { id: 'user', title: 'User' },
      { id: 'domain', title: 'Domain' }
    ],
    append: true,
});

// Extract all email from a text file. It's magic, no matter your file format, no matter it's content.
function extractEmailsFromFile(filePath) {
    const fileContent = fs.readFileSync(filePath, 'utf8');
    const emailRegex = /[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}/g;
    const emails = fileContent.match(emailRegex);
    return emails || [];
}

// Get your authentication token
async function getToken() {
  let uri = `https://token.mailtester.ninja/token?key=${key}`;
  return await axios.get(uri,{family:4}).then((res) => {
    let data = res.data;
    return data.token;
  }).catch(error => {console.log("Invalid Key", error); return null;});
}

// API Query
async function doGetRequest(email, token, i) {
  let uri = `https://happy.mailtester.ninja/ninja?email=${email}&token=${token}`;

  axios.get(uri,{family:4}).then(async (res) => {
    let data = res.data;
    await csvWriter.writeRecords([data]); 
  }).catch(error => {console.log("error", error.toString().substring(0,200), uri)});
}

// Main loop
async function start() {
  const token = await getToken();
  const startDate = new Date();

  // Extract Emails from Input & Output
  let emailArray =  extractEmailsFromFile(filePath1);
  const emailArrayDone =  extractEmailsFromFile(filePath2);

  // Remove all emails already checked
  const emailArrayToSet = new Set(emailArrayDone);
  emailArray = emailArray.filter(element => !emailArrayToSet.has(element));
  
  for (let i = 0; i < emailArray.length; i++) {
    const email =  emailArray[i];

    // A little bit of logging 
    console.log(`Query ${i} ${email}`);
    console.log('Timer (minutes) ', (((new Date() - startDate)) / 1000 / 60).toFixed(2));

    doGetRequest(email, token,i);

    // Throttle (100k / Day equivalent)
    await new Promise((resolve) => {setTimeout(resolve, 800)});
  };
  
  const endDate = new Date();
  console.log('Started at', startDate);
  console.log('Ended at', endDate);
}

// Let's go to party !!!
start();

Installation and Execution Instructions

We have included all required instructions as comments at the beginning of our script. 💪

This NodeJS script verifies a list of email addresses using MailTester Ninja API, then generates and displays the results in a CSV file. You can integrate this code or adapt it according to your needs.