What is whatsapp-web.js?

wwebjs/whatsapp-web.js — explained in plain English

Analysis updated 2026-05-18

★ 21,762JavaScriptAudience · developerComplexity · 3/5LicenseSetup · moderate

Mindmap

mindmap
  root((repo))
    What it does
      Send and receive messages
      Manage groups and members
      Handle media files
      React with emoji
    How it works
      Headless browser control
      QR code login
      Event listeners
      API methods
    Use cases
      Automated bots
      Customer workflows
      Internal tools
      Personal projects
    Tech stack
      Node.js
      JavaScript
      Browser automation
    Key features
      Text and media
      Group management
      Channels support
      Contact lookup
    Important notes
      Not official API
      Account block risk
      Reverse-engineered

mindmap root((repo)) What it does Send and receive messages Manage groups and members Handle media files React with emoji How it works Headless browser control QR code login Event listeners API methods Use cases Automated bots Customer workflows Internal tools Personal projects Tech stack Node.js JavaScript Browser automation Key features Text and media Group management Channels support Contact lookup Important notes Not official API Account block risk Reverse-engineered

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What do people build with it?

USE CASE 1

Build automated WhatsApp bots that send notifications or alerts to users without manual intervention.

USE CASE 2

Create customer support workflows that receive and respond to WhatsApp messages programmatically.

USE CASE 3

Manage group invitations, member additions, and group settings across multiple WhatsApp groups from code.

USE CASE 4

Integrate WhatsApp messaging into internal tools or dashboards for team communication.

What is it built with?

Node.jsJavaScriptPuppeteer

How does it compare?

	wwebjs/whatsapp-web.js	yjs/yjs	git-tips/tips
Stars	21,762	21,783	21,694
Language	JavaScript	JavaScript	JavaScript
Setup difficulty	moderate	moderate	easy
Complexity	3/5	4/5	1/5
Audience	developer	developer	developer

Figures from each repo's GitHub metadata at analysis time.

How do you get it running?

Difficulty · moderate Time to first run · 30min

Requires WhatsApp Web login via QR code scan in headless browser, which needs manual interaction on first run.

Use freely for any purpose including commercial. Keep the notice and disclose changes to the patent grant.

So what is it?

whatsapp-web.js is a Node.js library that lets you build programs that interact with WhatsApp, sending and receiving messages, managing groups, handling media files, and more, all through code rather than through the WhatsApp app manually. It works by controlling a headless (hidden) browser running the WhatsApp Web interface, intercepting the internal communication that the web app uses, and exposing it as a programming API you can call from JavaScript. When you set up the library, it launches a browser in the background, shows you a QR code to scan with your phone to log in (exactly like logging into WhatsApp Web yourself), and then keeps that session alive so your code can send and receive messages. You write event listeners, functions that trigger when a message arrives, when the client is ready, etc., and call methods to send messages, reply to specific messages, look up contacts, or manage group membership. The feature list from the README is extensive: sending text, images, audio, video, documents, stickers, location, and contact cards, reading incoming messages with the same variety of attachment types, managing groups (invite links, adding/removing/promoting members, changing group settings), reacting to messages with emoji, creating polls, and accessing WhatsApp Channels. The README is explicit about an important limitation: WhatsApp does not permit bots or unofficial clients on its platform, so using this library carries risk of your account being blocked. It is not affiliated with or endorsed by WhatsApp. You would use it to build automated WhatsApp bots or integrations for personal projects, internal tools, or customer communication workflows, understanding that it relies on reverse-engineering the WhatsApp Web interface rather than an official API.

Copy-paste prompts

Prompt 1

Show me how to set up whatsapp-web.js and send a text message to a contact using Node.js.

Prompt 2

How do I listen for incoming messages in whatsapp-web.js and reply to them automatically?

Prompt 3

Write a script using whatsapp-web.js that creates a WhatsApp group and adds members to it.

Prompt 4

How do I send an image or document file through WhatsApp using whatsapp-web.js?

Prompt 5

Explain the QR code login flow in whatsapp-web.js and how to keep the session alive.

Frequently asked questions