WebSocket DevTools

WebSocket DevTools is a free and open-source browser extension designed to provide developers with comprehensive control and debugging capabilities for WebSocket traffic. The extension is installed from the Chrome Web Store and integrates directly into Chrome DevTools, offering a dedicated interface for monitoring and managing WebSocket connections in real time.

The tool enables users to proxy WebSocket connections, track live connection details, visualize message flow, and receive status updates. It features advanced message simulation, allowing for the sending of custom messages in both directions—client to server and server to client—which supports testing handlers and simulating various scenarios. The extension also includes robust message blocking functionality, letting users intercept and block specific messages, simulate network issues, and test edge cases with precision. Real-time monitoring panels display active connections, message traffic with JSON formatting and timestamps, and provide toggles for message control.

Additional features include a favorites system for saving and managing message templates, enabling quick access to frequently used messages for efficient debugging. Developers can handle multiple connections simultaneously, review extensive message histories, and track connection statuses comprehensively. The simulation console offers a JSON editor with syntax highlighting and options for nested parsing and filling, streamlining the creation of custom WebSocket messages.

WebSocket DevTools is built to work with all frameworks and is tailored for developers who need to debug, test, and monitor WebSocket connections in their applications. Its open-source model and integration with Chrome DevTools make it accessible and adaptable for a wide range of development and debugging tasks involving WebSocket communication.