WebSocket tester. Connect to ws/wss endpoints, send messages, and inspect frames with auto-reconnect and JSON formatting.
100% browser-based — your data never leaves your device
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WebSocket Tester is a free online api tool that connect to websocket endpoints, send messages, and inspect frames. It works entirely in your browser — no downloads, no installations, and no server uploads required. backend developers, QA engineers, integration specialists use WebSocket Tester when they need a fast, privacy-respecting way to process api data without installing additional software. It supports capabilities such as live connection, message log, json auto-format. Additional features include presets. Common use cases include debug websocket connections for real-time chat applications, test websocket reconnection logic with auto-reconnect feature, inspect message frames and payloads for protocol debugging. All processing happens locally using modern browser APIs, which means your data never leaves your device. This makes WebSocket Tester ideal for working with sensitive data, proprietary code, or any situation where privacy matters.
WebSocket Tester is a free online api tool that helps you connect to websocket endpoints, send messages, and inspect frames. Key capabilities include live connection, message log, json auto-format. All processing is done locally in your browser — no data is uploaded, stored, or shared with any server. There are no sign-ups, no file size limits, and no hidden charges. It is commonly used to debug websocket connections for real-time chat applications.
Type or paste the WebSocket endpoint URL using ws:// for unsecured or wss:// for secured connections.
Press Connect to establish the WebSocket connection. The tool shows the connection status and any errors.
Type messages in the input area and click Send. Text and JSON messages are both supported.
View all sent and received messages with timestamps. JSON messages are automatically formatted for readability.
| Category | Details |
|---|---|
| Input Limits | Request timeout: Configurable (default: 30 s) |
| Response size: Browser memory bound | |
| Supported Formats | HTTP/1.1, HTTP/2, WebSocket, JSON, XML, Form data, Binary |
| Browser Engine |
|
All operations run entirely in your browser using built-in API APIs. No server uploads, no data storage, and no third-party requests.
WebSocket Tester is ideal when you need to debug websocket connections for real-time chat applications without installing software or uploading data to a server. Since everything runs in your browser, there is no setup time and no risk of your data being stored on external servers. For for collaborative API development and testing, consider using Postman. For for lightweight REST and GraphQL debugging, Insomnia may be a better fit. WebSocket Tester fills the gap between heavyweight desktop tools and insecure online services that require uploading your data.
No. WebSocket Tester processes everything entirely in your browser using JavaScript. Nothing you type, paste, or upload is ever transmitted to any server. Your data never leaves your device.
WebSocket enables real-time, bidirectional communication between a client and server. It is commonly used for chat applications, live feeds, gaming, and collaborative editing.
Yes. Enter any ws:// or wss:// endpoint URL and click Connect. The tool supports secure (wss) and unsecured (ws) connections.
Connect to any ws:// or wss:// endpoint with automatic reconnection.
View all sent and received messages with timestamps and formatting.
Automatically formats JSON messages for readability.
Save and reuse WebSocket endpoints and message templates.
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
Always use wss:// (secure WebSocket) in production to encrypt all messages in transit and avoid mixed content warnings.
Implement exponential backoff for reconnection attempts to avoid overwhelming the server when connections drop.
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