WAHA is a REST API for WhatsApp that runs on your own server and exposes WhatsApp functionality through HTTP endpoints.
The tool solves the problem of integrating WhatsApp messaging into applications without building direct integrations with WhatsApp's client. It works by wrapping WhatsApp Web in a containerized service with three engine options: WEBJS (browser-based), NOWEB (Node.js WebSocket), and GOWS (Go WebSocket). Users authenticate by scanning a QR code with their phone, then interact with WhatsApp through standard HTTP requests. The API supports sending text messages, retrieving screenshots, and managing multiple WhatsApp sessions within a single container.
Developers should choose this tool if they need to automate WhatsApp messaging in applications and prefer to self-host rather than rely on third-party services. It suits projects requiring WhatsApp bot functionality, message automation, or chat integration where operational control matters. The quick-start documentation emphasizes that setup takes less than five minutes with Docker as the only requirement, making it accessible for rapid prototyping. The README does not compare the tool to alternatives.
The project maintains active development with regular updates to support multiple engine implementations, indicating ongoing effort to provide flexibility in deployment options. Documentation is comprehensive with a dedicated site, Swagger interface, and dashboard example, suggesting investment in developer experience. The codebase is written in TypeScript and structured for extensibility across different WhatsApp connection protocols.
