What is a WebSocket?

A WebSocket is a communication protocol that gives you full-duplex communication over a single TCP connection. With regular HTTP, your client sends a request and then sits there waiting for a response. WebSockets are different — they keep the connection open so both sides can fire messages whenever they want, without either side having to ask first.

Why Use This Tool?

• If you're building anything that needs real-time data — a live chat app, an online game, a financial trading dashboard, or a live sports feed — you'll almost certainly need to test your WebSocket server at some point. This tool lets you connect and start sending messages immediately without writing any client code.
• For API testing, just paste your WebSocket server endpoint, send some JSON or plain text, and watch exactly what comes back. It's a lot faster than wiring up a test client from scratch.
• It's also genuinely useful for learning. You can watch the full lifecycle of a connection play out in front of you — the handshake, the back-and-forth messages, the close event, and any errors along the way.