WebSocket Playground

Interactive WebSocket client with message history and formatting

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WebSocket Endpoint & Frame

Endpoint URL (ws:// or wss://):

Frame Payload (Text / JSON):

Duplex Stream Terminal & Client Snippets

No WebSocket frames sent or received yet. Click Connect to stream.

// Configuration: AutoReconnect = true, PingInterval = 30s
const ws = new WebSocket('wss://ws.postman-echo.com/raw');

ws.onopen = () => {
  console.log('Connected to wss://ws.postman-echo.com/raw');
  ws.send("{\n  \"type\": \"ping\",\n  \"timestamp\": 1791789804926,\n  \"client\": \"Next DevUtilities\"\n}");
};

ws.onmessage = (event) => {
  console.log('Received frame:', event.data);
};

ws.onerror = (error) => console.error('WS Error:', error);
ws.onclose = () => console.log('WS Connection Closed');

import WebSocket from 'ws';

const ws = new WebSocket('wss://ws.postman-echo.com/raw');

ws.on('open', function open() {
  console.log('Connected to wss://ws.postman-echo.com/raw');
  ws.send("{\n  \"type\": \"ping\",\n  \"timestamp\": 1791789804926,\n  \"client\": \"Next DevUtilities\"\n}");
});

ws.on('message', function message(data) {
  console.log('Received: %s', data);
});

import asyncio
import websockets

async def connect():
    uri = "wss://ws.postman-echo.com/raw"
    async with websockets.connect(uri) as websocket:
        await websocket.send("""{
  "type": "ping",
  "timestamp": 1791789804926,
  "client": "Next DevUtilities"
}""")
        response = await websocket.recv()
        print(f"Received: {response}")

asyncio.run(connect())