WebSocket Tester

Connect to WS/WSS endpoints, send frames, and inspect real-time message traffic.

Privacy: 100% Client-Side. Your data never leaves this browser tab. Processing uses Web APIs and client-side libraries only.

Client-side WS/WSS tester. Try an echo server or your own endpoint.

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Why use a WebSocket sandbox?

Realtime APIs often need a quick way to open a WS/WSS socket, send payloads, and watch events without writing a custom client.

This sandbox connects from your browser so you can exercise chat, notifications, and streaming endpoints interactively.

How to use this tool

  1. Enter a ws:// or wss:// URL (or SSE URL) and connect from the sandbox.
  2. Send text/JSON frames and watch inbound messages as they arrive.
  3. Disconnect when finished; traffic stays between your browser and the target endpoint.

Frequently asked questions

Does stbox proxy WebSocket traffic?

Connections are opened from your browser to the target URL. stbox does not retain message bodies as a message broker.