WebSocket Tester helps you test and debug APIs quickly and accurately, right in your browser. Whether you need to connect to websocket endpoints, send messages, and inspect frames, this tool eliminatesintegration bugs, incorrect request formats, and protocol errors by giving you instant, reliable results. Every operation runs locally on your device — nothing is uploaded to any server, so your data stays completely private.
Key Features
Live Connection
Connect to any ws:// or wss:// endpoint with automatic reconnection.
Message Log
View all sent and received messages with timestamps and formatting.
JSON Auto-Format
Automatically formats JSON messages for readability.
Presets
Save and reuse WebSocket endpoints and message templates.
Common Use Cases
- Debug WebSocket connections for real-time chat applications
- Test WebSocket reconnection logic with auto-reconnect feature
- Inspect message frames and payloads for protocol debugging
WebSocket Tester
Connect to WebSocket endpoints, send messages, and inspect frames.
Frequently Asked Questions
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What is WebSocket Tester?
WebSocket Tester is an online API utility that connect to websocket endpoints, send messages, and inspect frames. Features include Live Connection, Message Log, JSON Auto-Format. Requests are made directly from your browser, with full visibility into headers, status codes, and response bodies.
Testing APIs typically involves dedicated desktop applications or command-line tools that can be cumbersome to set up. WebSocket Tester provides a lightweight browser-based alternative that requires no installation or configuration. Each request is transparent — you see exactly what is sent and received — making it ideal for quick debugging, exploring new endpoints, or demonstrating API behavior to team members.
Frequently Asked Questions
What is WebSocket used for?
WebSocket enables real-time, bidirectional communication between a client and server. It is commonly used for chat applications, live feeds, gaming, and collaborative editing.
Can I connect to any WebSocket URL?
Yes. Enter any ws:// or wss:// endpoint URL and click Connect. The tool supports secure (wss) and unsecured (ws) connections.
Does it support reconnection?
Yes. The auto-reconnect feature automatically reconnects if the connection drops, with a configurable retry interval.
Are my WebSocket messages logged?
Message history is stored locally in your browser during the session and is cleared when you disconnect or refresh the page.
How does the Live Connection feature work?
The Live Connection feature connect to any ws:// or wss:// endpoint with automatic reconnection. It is designed to be intuitive and responsive, giving you immediate feedback as you interact with the tool. All processing happens locally in your browser.
What is the benefit of message log?
Message Log view all sent and received messages with timestamps and formatting. This capability sets WebSocket Tester apart from basic alternatives by providing more comprehensive functionality while maintaining the privacy and speed of local processing.
Is WebSocket Tester really free to use?
Yes, WebSocket Tester is completely free with no hidden charges, no sign-up requirements, and no usage limits. You can use it as often as you need, for any purpose — personal projects, commercial work, or educational use. There are no premium tiers or paid features.
Does WebSocket Tester work on mobile devices?
Yes, it works on any device with a modern web browser — desktop, tablet, or phone. The interface is responsive and adapts to your screen size. Since all processing is done locally, you get the same performance regardless of your device.
What happens to my data when I use WebSocket Tester?
Your data never leaves your device. Every operation is performed locally in your browser using JavaScript. No information is uploaded, stored, logged, or shared with any server. This privacy-first approach means you can work with sensitive data — passwords, API keys, personal information — without any risk of exposure.
Key Features
Live Connection
Connect to any ws:// or wss:// endpoint with automatic reconnection.
Message Log
View all sent and received messages with timestamps and formatting.
JSON Auto-Format
Automatically formats JSON messages for readability.
Presets
Save and reuse WebSocket endpoints and message templates.
Common Use Cases
WebSocket Tester is useful in a variety of scenarios across different workflows:
Debug WebSocket connections for real-time chat applications
Test WebSocket reconnection logic with auto-reconnect feature
Inspect message frames and payloads for protocol debugging
Tips & Best Practices
Use wss:// for production
Always use wss:// (secure WebSocket) in production to encrypt all messages in transit and avoid mixed content warnings.
Handle reconnection gracefully
Implement exponential backoff for reconnection attempts to avoid overwhelming the server when connections drop.
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