Instant mock WebSocket servers.
A disposable wss:// endpoint for testing your realtime apps. No signup, no setup. Customize it exactly how you need it.
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1
Create your endpoint
One click on the right. You get a live wss:// URL, ready to connect.
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2
Send & receive messages
Point your app at the URL, or use the built-in console to talk to your endpoint live. Try sending ping, the demo rules answer pong.
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3
Shape the behavior
- Interval pushes a payload every few seconds.
- Trigger replies to matching messages.
- Chaos drops messages or kills the connection to test your reconnect logic.
Cheat sheet
Payloads can use template variables, rendered at send time:
Limits: 1h lifetime · 3 connections per endpoint · 3 rules · 1KB payloads · 2 trigger replies/s
No endpoint yet
Create one and start sending frames in seconds. It comes preloaded with a 5-second ticker and a ping → pong rule.
Rules
Console
Connects as a regular client — it uses one of your 3 connection slots.
— no frames yet —