Zap GPT is an open-source integration that lets people talk to ChatGPT through WhatsApp text messages. Published on GitHub with about 340 stars and last updated in September 2025, the Node.js project answers questions and commands automatically inside the messaging app people already use all day.
The project is built on whatsapp-web.js and the OpenAI API. You clone the repository, rename the example environment file and fill in the values it needs, install dependencies with npm, and start the service. A QR code is shown in the terminal, and scanning it with WhatsApp connects the number that will host the bot. From then on, users interact with ChatGPT by sending ordinary WhatsApp messages and receiving automated replies based on their questions and commands. A complete step-by-step guide written by the author is linked from the repository for anyone building the integration from scratch.
The implementation is intentionally small: a Node.js service, an environment file for configuration, and the WhatsApp connection handled through the library’s session flow. That makes the repository a practical starting point for similar projects: a small business can run the bot on an ordinary computer or an inexpensive server, and customers get answers on a WhatsApp number they can message like any other contact.
Zap GPT is free open-source code that you run yourself. The only running cost is your own OpenAI API usage for the replies the bot generates.
Zap GPT is for developers and small teams, especially in WhatsApp-first markets, who want a quick way to put a ChatGPT-style assistant in front of customers or communities without building a separate app.