TIL: Scripting WebSocket Tests With websocat

wscat is interactive. websocat is scriptable.

echo '{"type":"ping"}' | websocat wss://api.example.com/v1/listen

Pipes input from stdin into the WebSocket. Output goes to stdout.

websocat --exit-on-eof wss://api.example.com/v1/listen < messages.jsonl

Send a file of JSON lines through a WebSocket connection and exit when the input ends.

How do I install websocat?

brew install websocat

Does websocat support SSL?

Yes. Use wss:// URLs. The library handles TLS automatically.