WebSocket Tester Online — Test ws:// & wss:// Connections Free – DataMorph

Test WebSocket connections online with our free browser-based WebSocket client. Connect to ws:// and wss:// endpoints, send messages, inspect responses, and debug real-time streams instantly — no install.

WebSocket Tester Online — Free Browser-Based WebSocket Client

A WebSocket tester lets you connect to any WebSocket server (ws:// or wss://) directly from your browser, send messages, and inspect server responses in real-time. No software installation required — this free online WebSocket client runs entirely in the browser. Use it to debug chat applications, live data feeds, real-time dashboards, financial ticker streams, IoT sensors, and WebSocket API endpoints.

How to Test a WebSocket Connection Online

1. Enter your WebSocket server URL (e.g., wss://echo.websocket.org) in the connection bar.
2. Click Connect. The status badge turns green when the connection is established.
3. Type a text or JSON message and press Enter or click Send.
4. Sent messages appear in blue on the right; received messages appear in grey on the left.
5. System events (connect, disconnect, errors) appear in yellow in the center.
6. Click Disconnect to close the connection cleanly.

Public WebSocket Echo Servers for Testing

Use these free public echo servers to verify your WebSocket client setup — they echo back every message you send:

• wss://echo.websocket.org — Classic echo server by websocket.org
• wss://ws.postman-echo.com/raw — Postman's public WebSocket echo endpoint
• ws://localhost:PORT — Your own local development server

ws:// vs wss:// WebSocket Protocol

ws:// is the unencrypted WebSocket protocol (like HTTP). wss:// is the TLS-encrypted version (like HTTPS). Because this WebSocket tester runs over HTTPS, browsers block ws:// connections to external servers due to mixed-content security policy. Always use wss:// for production servers. Local ws://localhost connections still work fine because they are same-machine connections.

WebSocket ReadyState Values

The WebSocket.readyState property shows the current connection state:

• 0 (CONNECTING) — Connection is being established
• 1 (OPEN) — Connection is open and ready to send/receive messages
• 2 (CLOSING) — Connection is being closed
• 3 (CLOSED) — Connection is closed or could not be opened

Common WebSocket Error Codes

• 1000: Normal closure — connection closed cleanly and intentionally
• 1001: Going away — server is shutting down or browser is navigating away
• 1006: Abnormal closure — connection dropped unexpectedly (CORS issue, server down, or ws:// blocked from HTTPS)
• 1011: Server error — internal server error caused the connection to fail
• 1015: TLS handshake failure — certificate or TLS issue on wss://

Frequently Asked Questions

How do I test a WebSocket connection online?

Enter your WebSocket URL (ws:// or wss://) in this free online WebSocket tester and click Connect. Once the status turns green, send messages and see real-time server responses. No installation, no account, no software needed.

What is a WebSocket connection tester?

A WebSocket connection tester is a browser-based client that lets you establish a persistent WebSocket connection to any server, send messages, and inspect responses — useful for debugging WebSocket APIs, real-time apps, and verifying endpoint behavior without writing code.

Why does my WebSocket connection fail with error 1006?

Error 1006 (abnormal closure) means the connection dropped unexpectedly. Common causes: server rejected the connection (CORS or auth issue), wrong URL, server is down, or ws:// blocked from an HTTPS page.

Can I test a local WebSocket server with this tool?

Yes. ws://localhost:PORT or ws://127.0.0.1:PORT connections work fine from a browser. For local HTTPS environments, some browsers may restrict ws:// — use wss:// with a self-signed certificate.

Does this WebSocket client support sending JSON?

Yes. Type any JSON payload in the message field and click Send. Example: {"type":"subscribe","channel":"prices"}. Server responses appear in the message log with timestamps.

What is the difference between ws:// and wss://?

ws:// is unencrypted WebSocket (like HTTP). wss:// is encrypted WebSocket over TLS (like HTTPS). Use wss:// for all production servers. Browsers running on HTTPS pages block ws:// connections to external hosts due to mixed-content security policy.