WebSocket Tester

WebSocket Tester | Elysia Tools

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

1Enter the target WebSocket URL (starting with ws:// or wss://) and optionally specify a subprotocol.
2Click connect to establish a live connection, with the option to enable auto-reconnect if the connection drops unexpectedly.
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

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

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.

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

WebSocket Tester

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

Key facts

Overview

When to use

How it works

Use cases

Examples

1. Debugging a Real-Time Chat Server

2. Testing a Live Stock Ticker Feed

FAQ

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