Ethereum: Binance API How to connect to a web socket using Javascript?

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Connecting to the Binance WebSocket API with JavaScript: keeping K-lines active

As a developer using the Binance API, you are probably familiar with real-time data mining. However, when you use GET requests to retrieve individual lines (klines) of data, the resulting JSON response can quickly become outdated due to network delays and congestion. To solve this problem, we will look at how to keep K-lines active by connecting to the Binance WebSocket API using JavaScript.

Binance WebSocket API Overview

Before diving into the code, it’s important to understand the basics of the Binance WebSocket API:

• The ws endpoint provides real-time data updates for various markets.

• You can subscribe to specific endpoints and receive push notifications when new data is available.

• To keep K-lines active, you need to establish a persistent connection using WebSockets.

Connecting to the Binance WebSocket API with JavaScript

To connect to the Binance WebSocket API using JavaScript, follow these steps:

• Install the necessary libraries: You will need ws (WebSockets library) and crypto for cryptographic functions. Run:

npm install ws crypto

• Create a WebSocket Connection: Establish a WebSocket connection with the following code:

const WebSocket = require('ws');
const wss = new WebSocket.Server({ port: 8080 });
// Processing of incoming connections and subscription to klines
wss.on('connection', (ws) => {
console.log('Client connected');
// Subscribe to the klines endpoint in '/klines'
ws.on('message', (data) => {
if (data.type === 'kline') {
const { symbol, timeInterval, open, high, low, close, volume } = JSON.parse(data);
console.log(New kline received: ${symbol} @ ${timeInterval} interval);
// Update K-line data in your application
updateKlines(symbol, timeInterval, open, high, low, close, volume);
}
});
ws.on('close', () => {
console.log('Client disconnected');
});
});

This code creates a WebSocket server and listens for incoming connections. When a new connection is established, it subscribes to the klines endpoint in /klines and processes incoming messages.

K-Line Data Processing

To process the new data received in message events, you can use the JSON.parse() function to parse the incoming message:

ws.on('message', (data) => {
if (data.type === 'kline') {
const { symbol, timeInterval, open, high, low, close, volume } = JSON.parse(data);
console.log(New kline received: ${symbol} @ ${timeInterval} interval);
// Update K-Line data in your application
updateKlines(symbol, timeInterval, open, high, low, close, volume);
}
});

Maintaining the activity of K-lines

To keep K-lines active, you need to establish a persistent connection using WebSockets. This can be achieved by creating a WebSocket server that listens for incoming connections and processes messages accordingly.

In this example, we create a single WebSocket server on port 8080:

wss = new WebSocket.Server({ port: 8080 });

However, in the provided code snippet, we establish a connection from only one client. To keep K-lines active, you need to establish multiple connections and process incoming messages.

Updating your app

To update your application with the latest K-line data, you can modify the updateKlines function:

“`javascript

function updateKlines(symbol, timeInterval, open, high, low, close, volume) {

const klineData = JSON.parse(JSON.stringify({}); // Create a copy of the original data)

klineData.symbol = symbol;

klineData.timeInterval = timeInterval;

klineData.open = open;

klineData.high = high;

klineData.low = low;

klineData.close = close;

klineData.