WhatsApp Web API 
A simple tool to connect WhatsApp Web to Javascript
Terms of use
YOU WILL NOT USE THIS API, OR PARTS OF IT, TO MASS-MESSAGE, SPAM, AUTO-MESSAGE OR BULK-MESSAGE. YOU WILL NOT SEND MESSAGE TO PEOPLE THAT ARE NOT ON YOUR CONTACT LIST, OR THAT HAVE MESSAGED YOU BEFORE, WITH A CLEAR PURPOSE TO BE MESSAGED BACK FROM A BOT. YOU WILL EXPLICITLY INFORM YOUR USERS THAT YOU USE AN AUTOMATED SOFTWARE. YOU WILL NOT USE THIS API TO INTERFERE WITH WHATSAPP'S TERMS OF SERVICE. YOU WILL NOT SEND ANY CONTENT THAT VIOLATES WHATSAPP'S TERMS OF SERVICE THROUGH THIS SOFTWARE
TL;DR: Don't be an a$$hole. WhatsApp is not a product for commercial use. Bots and automation softwares should be used with care - for yourself, for WhatsApp and for your recipients.
Getting Started β Chrome Extension Manual Instalation
Since the Chrome Extension isn't listed on the Webstore, you can manually install the extension. Here is how:
- Clone or download this repository.
- Go to chrome://extensions
- Tick Developer Mode (turn it on)
- Load an unpacked extension
- Select the /ext/ folder of this repository
When the WhatsApp web window loads, the extension will add the API to the page for simple use. Then you can write scripts on WhatsApp web from the Javascript console or using a user script extension (Such as TamperMonkey)