WebSocket Online Tester

What Is WebSocket?

WebSocket is a TCP-based full-duplex real-time communication protocol that enables bidirectional data transmission after a persistent connection is established between the client and server. Unlike traditional HTTP requests, WebSocket does not require the client to continuously poll the server, making it suitable for chat, real-time notifications, online collaboration, market data, game communication, and other real-time scenarios.

What Is the WebSocket Online Tester Used For?

The WebSocket Online Tester can establish a WebSocket connection directly in the browser and quickly verify whether a WebSocket service can connect and communicate correctly. Enter a ws:// or wss:// address to view the connection status, send test messages, and receive server responses in real time.

• Test WebSocket and WSS service connections
• Send text messages to a WebSocket server
• View WebSocket messages returned by the server in real time
• View connection, disconnection, and error status information
• Configure WebSocket subprotocols
• Troubleshoot real-time communication issues through message logs

How to Use the WebSocket Online Tester?

1. Enter the server address in the WebSocket address field, such as wss://example.com/socket.
2. If the server requires a specific WebSocket subprotocol, enter it in the protocol field. Multiple protocols can be separated by commas.
3. Click “Connect” to establish the WebSocket connection.
4. After connecting, enter the data to send in the message input field.
5. Click “Send” to send the message to the WebSocket server.
6. Server responses are displayed in real time in the message console.
7. Click “Disconnect” to close the connection after testing, or click “Clear” to remove the current message log.

What Is the Difference Between ws:// and wss://?

ws:// is a standard WebSocket connection for unencrypted communication, while wss:// is a TLS-encrypted WebSocket connection, similar to the relationship between HTTPS and HTTP.

If a website is opened through HTTPS, browsers usually restrict pages from directly connecting to unencrypted ws:// services. Therefore, wss:// is generally recommended for production environments. WSS servers need a valid TLS/SSL certificate.

What Problems Can WebSocket Testing Check?

• Connection issues: Check the WebSocket address, server port, and network connection.
• Protocol issues: Check whether the server requires a specific WebSocket subprotocol.
• TLS issues: When using WSS, help identify possible HTTPS/TLS configuration problems.
• Message issues: Send test data and observe whether the server returns the expected messages.
• Disconnection issues: Check connection close status and close codes to help identify disconnection causes.
• API debugging: Quickly verify client-server data exchange when developing WebSocket APIs.

Frequently Asked Questions About WebSocket Testing

Why Does a WebSocket Connection Fail?

A WebSocket connection may fail because the server is not running, the address or port is incorrect, reverse proxy settings are incorrect, the TLS certificate has issues, network policies or firewalls block the connection, or WebSocket Upgrade is not configured correctly. First verify the server address and then check the WebSocket server logs.

How Should a WebSocket Address Be Written?

Standard WebSocket services use ws://domain:port/path, while encrypted WebSocket services use wss://domain:port/path. For example, wss://example.com/ws.

Why Is There No Message After a Successful Connection?

A successful WebSocket connection only means that the TCP/TLS connection and WebSocket handshake succeeded. It does not mean that the server will actively send data. Some services require the client to first send authentication information, subscription commands, or business messages.

Can a Browser Test WebSocket Directly?

Yes. Modern browsers provide native WebSocket APIs, so no additional client software is required. This tool uses the browser’s WebSocket capabilities to establish connections and send and receive messages.

WebSocket Online Tester Features

• No software installation required
• Support ws:// and wss:// WebSocket addresses
• Support custom WebSocket subprotocols
• Display connection status and communication messages in real time
• Distinguish sent and received messages with different icons
• Clearly display connection errors and abnormal states
• Automatically count messages for easier debugging
• Scrollable message logs for continuous testing
• WebSocket communication is performed directly in the browser

Suitable Use Cases

The WebSocket Online Tester is suitable for frontend developers, backend developers, API debugging personnel, and website operations staff. It can be used for WebSocket API debugging, real-time messaging service testing, chat applications, real-time data push, online game communication, and WSS security connection testing.

No standalone WebSocket client is required. Enter a WebSocket or WSS address to quickly establish a connection, send messages, and view server responses for daily WebSocket API debugging and connectivity testing.