Step 1: Plan the Website

• Purpose: Validate a list of email addresses in bulk.

  
  
  
  

• Features:

  • Upload a CSV or TXT file containing email addresses.

  • Validate emails (check syntax, domain, and mailbox existence).

  • Display validation results (valid, invalid, disposable, etc.).

  • Download the validated list.

Step 2: Choose a Tech Stack

• Front-end: HTML, CSS, JavaScript (React, Vue, or plain JS).

• Back-end: Node.js, Python (Flask/Django), or PHP.

• Database: Optional (if you want to store results).

• Email Validation API: Use a third-party API like:

  • ZeroBounce

  • Hunter.io

  • QuickEmailVerification

  • Or use an open-source library like email-validator (Python) or validator.js (Node.js).

Step 3: Set Up the Front-End

Create a simple interface for users to upload files and view results.

Step 4: Set Up the Back-End

Use a framework like Node.js (Express) or Python (Flask) to handle file uploads and email validation.

Node.js Example

1. Install dependencies:

npm install express multer validator

Create server.js:

const express = require('express');
const multer = require('multer');
const validator = require('validator');
const fs = require('fs');
const path = require('path');

const app = express();
const upload = multer({ dest: 'uploads/' });

app.use(express.static('public'));

app.post('/validate', upload.single('file'), (req, res) => {
  const filePath = req.file.path;
  const emails = fs.readFileSync(filePath, 'utf8').split('\n').map(email => email.trim());
  const results = emails.map(email => {
    return {
      email,
      valid: validator.isEmail(email),
    };
  });

  fs.unlinkSync(filePath); // Delete the uploaded file
  res.json({ results: results.map(r => `${r.email}: ${r.valid ? 'Valid' : 'Invalid'}`) });
});

app.listen(3000, () => {
  console.log('Server running on http://localhost:3000');
});

Run the server:

node server.js

Step 5: Integrate Email Validation API

If you want to use a third-party API, replace the validation logic in the back-end with API calls.

Example using ZeroBounce API:

const axios = require('axios');

async function validateEmail(email) {
  const apiKey = 'YOUR_ZEROBOUNCE_API_KEY';
  const url = `https://api.zerobounce.net/v2/validate?api_key=${apiKey}&email=${email}`;

  try {
    const response = await axios.get(url);
    return response.data.status === 'valid';
  } catch (error) {
    console.error('Error validating email:', error);
    return false;
  }
}

Step 6: Deploy the Website

• Use platforms like Vercel, Netlify, or Heroku for deployment.

• Ensure your back-end is hosted on a server (e.g., AWS, DigitalOcean) if using a custom back-end.

Step 7: Test and Optimize

• Test the website with different file formats and email lists.

• Optimize for performance and scalability if handling large files.

This is a basic implementation. You can enhance it with features like:

• User authentication.

• Payment integration for premium validation.

• Advanced email validation (e.g., checking for disposable emails).