Introduction

Want to integrate ChatGPT with WhatsApp? Whether you're automating customer support, building conversational bots, or exploring AI tools, this tutorial will guide you step-by-step on how to set up the integration using Node.js and OpenAI.

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Step 1: Set up WhatsApp Business API

You can use Vonage or Twilio for WhatsApp API access. Register your number, verify your account, and set up your sandbox environment.

POST /messages
Authorization: Bearer {your_token}
{
  "to": "whatsapp:+919999999999",
  "from": "whatsapp:+14155238886",
  "message": {
    "content": "Hello from WhatsApp Bot!"
  }
}

Step 2: Get your OpenAI API Key

Sign up on OpenAI, generate your API key, and keep it secure.

Step 3: Create a Node.js Server

Build a simple Express server that listens to incoming WhatsApp messages and sends a response from ChatGPT.

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

const app = express();
app.use(express.json());

app.post('/webhook', async (req, res) => {
  const incomingMsg = req.body.message.text;

  const gptResponse = await axios.post('https://api.openai.com/v1/chat/completions', {
    model: "gpt-3.5-turbo",
    messages: [{ role: "user", content: incomingMsg }],
  }, {
    headers: {
      Authorization: `Bearer ${process.env.OPENAI_API_KEY}`,
    }
  });

  // Send response back to WhatsApp
  await axios.post('https://your-whatsapp-provider.com/send', {
    to: req.body.from,
    message: gptResponse.data.choices[0].message.content,
  });

  res.sendStatus(200);
});

Step 4: Secure and Deploy

Deploy your server on Render, Railway, Vercel, or Heroku. Use environment variables to keep your API keys secure. Ensure HTTPS is enabled for WhatsApp webhook validation.

Step 5: Test the Bot

Send a message from your WhatsApp number and watch ChatGPT reply! You can now build custom flows, integrate FAQs, or connect it with your CRM.

Conclusion

This integration is just the beginning. Combine the power of ChatGPT with WhatsApp to automate and scale your communication like never before.

Happy coding! 🚀