How to Test WebSocket Connections in the Browser (No Install Required)

WebSocket bugs are some of the hardest to debug. The connection looks fine, the server starts without errors, but something isn't working — and you don't know if the problem is your client code, your server, or the connection itself. The fastest way to rule out your client code entirely is to test the WebSocket endpoint directly in a browser-based tester. No install, no dependencies, no writing a throwaway script just to send one message. What is a WebSocket? A WebSocket is a persistent, two-way communication channel between a browser and a server. Unlike HTTP — where the client sends a request and waits for a response — WebSockets let the server push data to the client at any time without being asked. The connection starts as a standard HTTP request and then upgrades via a handshake. Once established, both sides can send messages freely until one of them closes the connection. WebSocket URLs use ws:// for unencrypted connections and wss:// for SSL-encrypted ones — equivalent to http:/