Send WhatsApp Messages in Node.js - Complete Guide

Automate WhatsApp messaging using the WhatsMate WA Gateway REST API

Posted on February 17, 2016   Share on Facebook Share on LinkedIn Share on Twitter Share on Google+

Last reviewed: January 28, 2026  

Automate WhatsApp Messaging with Node.js

Looking to integrate WhatsApp messaging into your Node.js applications? This guide walks you through sending WhatsApp messages using Node.js and the WhatsMate WA Gateway REST API. Perfect for JavaScript developers building real-time notification systems, chatbots, or automated messaging workflows.

📋 Prerequisites

Before you begin, ensure you have:

  1. A WhatsMate WA Gateway account - Required for API access
  2. Recipient registration - Each recipient must register with the Gateway first
  3. Node.js runtime - Version 12 or higher installed
  4. Basic JavaScript knowledge - Familiarity with Node.js and npm

⚠️ Important: Recipients must register with the WhatsMate WA Gateway before they can receive messages. Unregistered users will not receive any messages from the Gateway. Registration instructions are available on the official WhatsMate site.

🎥 Video Walkthrough

📝 Step-by-Step Implementation

Follow these steps to send your first WhatsApp message from a Node.js application:

1. Copy the Node.js Template

Start by copying the following source code into a JavaScript file named send-whatsapp.js:

2. Configure a few Parameters

Customize these key parameters in the JavaScript code:

  • Line 5: Replace with your gateway instance ID
  • Lines 6-7: Update with your Client ID and Secret
  • Line 10: Specify the target phone number (including the country code, e.g., 12025550108)
  • Line 11: Provide your message content

3. Make the Script Executable

Set execute permissions on your Node.js script:

chmod 755 send-whatsapp.js

4. Send Your Message

Run the script to deliver your WhatsApp message:

./send-whatsapp.js

🔧 Common Use Cases

This Node.js integration approach is ideal for:

  • Real-time applications - Send instant notifications from web apps
  • Chatbots and automation - Integrate WhatsApp into conversational interfaces
  • Microservices - Add messaging capabilities to distributed systems
  • Webhooks and APIs - Trigger WhatsApp messages from external events

🚀 Get Started Today

Ready to integrate WhatsApp messaging into your Node.js applications? You’ll need a trial account to access the API. Sign up for a 2-week trial and start sending messages within minutes!

Next Steps: Once you’ve mastered basic message sending, explore advanced features like sending images, documents, or group messages through the WhatsMate API documentation.