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WebSocket Tester

· Last updated：2026-06-22

Connect to any WebSocket (ws:// or wss://) endpoint from your browser, send and receive messages, and inspect open/close/error events with codes — ideal for debugging real-time APIs and sockets

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Written by the Elysia Tools team
T Test15

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category
Development
Input types
text, checkbox
Output type
interactive
Sample coverage
4
API ready
Yes

Overview

The WebSocket Tester is an interactive browser-based client that allows you to establish connections to any ws:// or wss:// endpoint. It enables you to send and receive real-time messages, configure subprotocols, toggle auto-reconnection, and inspect connection events like open, close, and error codes directly from your browser.

When to use

  • When developing or debugging real-time APIs, chat applications, or live data feeds that rely on WebSocket connections.
  • When you need to verify if a remote WebSocket server is reachable and accepting connections without writing custom client-side code.
  • When testing how your WebSocket server handles connection drops, subprotocol negotiations, or specific payload formats.

How it works

  1. 1Enter the target WebSocket URL (starting with ws:// or wss://) and optionally specify a subprotocol.
  2. 2Click connect to establish a live connection, with the option to enable auto-reconnect if the connection drops unexpectedly.
  3. 3Send text payloads directly to the server and view incoming messages, connection status changes, and error events in the real-time log.

Use cases

  • Testing a real-time chat server by sending JSON payloads and verifying immediate broadcast responses.
  • Debugging a live financial data feed to ensure the connection remains stable and correctly parses incoming updates.
  • Verifying subprotocol negotiation on a custom GraphQL subscription endpoint.

Examples

1. Debugging a Real-Time Chat Server

Backend Developer

Background

A developer is building a chat application and needs to verify that the backend server correctly receives, processes, and broadcasts messages to connected clients.

Problem

Manually writing client-side connection scripts just to test basic message delivery is time-consuming.

How to use

Enter the local server URL ws://localhost:8080/chat, set the subprotocol to chat, and click connect. Send a JSON message like {"user": "Alice", "text": "Hello"}.

URL: ws://localhost:8080/chat, Subprotocol: chat

Outcome

The connection opens successfully, the sent message is logged, and the server's broadcast response is immediately displayed in the incoming message feed.

2. Testing a Live Stock Ticker Feed

Frontend Engineer

Background

An engineer is integrating a live stock price widget and needs to inspect the structure of the incoming data stream from a secure third-party API.

Problem

The connection occasionally drops during network switches, making it hard to observe continuous data without manual page refreshes.

How to use

FAQ

Can I connect to both secure and insecure WebSocket endpoints?

Yes, the tool supports both unencrypted ws:// and secure encrypted wss:// protocols.

What is the purpose of the subprotocol option?

It allows you to specify application-level protocols (like graphql-ws or chat) that the server and client agree to use during the handshake.

How does the auto-reconnect feature work?

If enabled, the client will automatically attempt to re-establish the connection if the socket closes unexpectedly.

Can I inspect connection errors and close codes?

Yes, the event log displays connection status changes, including specific close codes and error events.

Does this tool send my WebSocket data to a third-party server?

No, the connection is established directly from your browser to the specified WebSocket endpoint.

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Enter the secure endpoint wss://api.stockstream.com/quotes, check the 'Auto-reconnect on unexpected close' option, and initiate the connection.

URL: wss://api.stockstream.com/quotes, Auto-reconnect: Enabled

Outcome

The client connects, displays incoming price updates in real-time, and automatically reconnects if the connection is interrupted.