Official APIs

Not officially public and not free

• https://developers.facebook.com/docs/whatsapp/on-premises/get-started/postman/
  • https://www.postman.com/meta
• https://business.whatsapp.com/developers/developer-hub

However there are 2 libraries that works around that

wwebjs

Web JS interacts with WhatsApp via WhatsApp Web ( https://web.whatsapp.com ). It uses puppeteer ( https://www.npmjs.com/package/puppeteer ) to visit WhatsApp Web in a background browser, and uses ModuleRaid ( https://www.npmjs.com/package/@pedroslopez/moduleraid ) to pick out various info from WhatsApp Web.

• https://github.com/pedroslopez/whatsapp-web.js
  • https://docs.wwebjs.dev/
  • https://wwebjs.dev/

Baileys

Baileys directly uses the websocket mechanism behind WhatsApp Web to interact with WhatsApp

• https://github.com/WhiskeySockets/Baileys
  • https://whiskeysockets.github.io/Baileys/modules.html
  • https://whiskeysockets.github.io/docs/intro
  • Help forum: https://discord.com/invite/WeJM5FP9GG
• Other usage examples:
  • https://github.com/APdev93/WaBot-With-PairingCode
  • https://www.youtube.com/watch?v=DHEIO9YdRV8
    • https://github.com/saifkhan7865/baileys-integration-youtube
    • https://discord.com/invite/9v43X2tt89
  • Simple usage example: https://gist.github.com/atabegruslan/b9d8b28d376e55c08e7ddb25176b33c9

Other relevant websites

• https://waha.devlike.pro/docs/overview/quick-start/
  • https://github.com/devlikeapro/whatsapp-http-api
  • https://boosty.to/wa-http-api
• Reverse-engineered WhatsApp Web: https://github.com/sigalor/whatsapp-web-reveng
• Other related libraries: https://www.libhunt.com/r/whatsapp-http-api
• https://medium.com/@anisettyanudeep/demystifying-the-whatsapp-web-desktop-qr-code-scanning-process-9e5a0ba10c22