API testingPremium
WebSocket tester
Connect to any wss:// — send messages, watch traffic live.
Realtime tab · 7-day free trial · Premium $9.99 / yr
What it does
WebSocket is the bidirectional streaming protocol modern web apps use for chat, presence, live updates, and AI streaming. Testing a WebSocket endpoint by hand requires either CLI tools or a small client — VibeGear gives you the client for free.
Why use VibeGear's websocket tester
- ✓ws:// and wss:// out of the box
- ✓Subprotocols — the {bearer, <token>} trick works
- ✓Auto-reconnect with exponential backoff
- ✓Send composer with ⌘ + Enter, JSON pretty-print button
- ✓Binary frames sized and labeled in the timeline
How to use it
- 1Realtime tab → WebSocket.
- 2Paste your wss:// URL, hit Connect.
- 3The status pill turns green; messages stream in below.
- 4Type a message and ⌘ + Enter to send.
Frequently asked
Can I send custom headers?
The browser WebSocket API doesn’t allow custom headers — only subprotocols. Many APIs use the subprotocol header to pass tokens. For full custom-header support, use SSE (we use fetch under the hood, which does allow them).
Related tools
★ Premium
One install. Every tool above.
7 days free, then VibeGear Premium is $9.99 / €9.99 per year. Everything runs locally.
Install & start trial →→