I got binary response from websocket. How to convert from binary to JSON?

muthukumardab

I got the below response as binary that needs to be converted into JSON / string.

Jeet Pattani

@muthukumardab
Try the below code

//Working Code which fetches prices of reliance, sbi, and nifty

const WebSocket = require('ws');

// WebSocket URL
const url = 'ws://smartapisocket.angelone.in/smart-stream';

// Authentication headers
const headers = {
  'Authorization': 'Bearer eyJhbGciOiJIUzUxMiJ9.eyJ1c2VybmFtZSI6IlA1Mjk3NzQiLCJyb2xlcyI6MCwidXNlcnR5cGUiOiJVU0VSIiwiaWF0IjoxNjg2NzE2ODYwLCJleHAiOjE2ODY4MDMyNjB9.WmoIdanOGGXox-We42Bre-qSK6yyZQlcci4h3JnLxc8Dt7WgmJZa7IzergbdB2VWPviVg7uKWAi-rOr0H5ijQw',
  'x-api-key': 'erZDHFHD',
  'x-client-code': 'P529774',
  'x-feed-token': 'eyJhbGciOiJIUzUxMiJ9.eyJ1c2VybmFtZSI6IlA1Mjk3NzQiLCJpYXQiOjE2ODY3MTY4NjAsImV4cCI6MTY4NjgwMzI2MH0.fWOQ57fcTGqzuVlktvzFYVe7ztZrt8TFIkrLXvX-Z2HqOtR3cSxsDRW9uv8a9YSCKxt348gAmSondkaHmGaBBA'
};

// Create a WebSocket instance
const socket = new WebSocket(url, { headers });

// Handle WebSocket connection open
socket.on('open', () => {
  console.log('WebSocket connected');

  // Send a subscription request
  const subscriptionRequest = {
    //correlationID: '',
    action: 1,
    params: {
      mode: 1,
      tokenList: [
        {
          exchangeType: 1,
          tokens: ['26000','2885','3045','99926009','99926011']

          /*
          NIFTY-50: 26000
          RELIANCE-EQ: 2885
          SBIN-EQ: 3045
          NIFTY BANK:99926009
          NIFTY MIDCAP 100:99926011
          SENSEX: 99919000

          */

        },
       /* {
          exchangeType: 5,
          tokens: ['234230', '234235', '234219']
        }*/
      ]
    }
  };

  socket.send(JSON.stringify(subscriptionRequest));
});

// Handle received messages from the WebSocket
socket.on('message', (message) => {
  // Parse the received binary data based on the provided response contract

  // Example: Extract the Last Traded Price (LTP) from the received data
  const data = new Uint8Array(message);
  const ltpBytes = data.slice(43, 47);
  const ltpValue = ltpBytes.reduce((value, byte, index) => value + byte * Math.pow(256, index), 0);
  const ltp = ltpValue / 100;

  console.log('Received LTP:', ltp);
});

// Handle WebSocket connection close
socket.on('close', () => {
  console.log('WebSocket connection closed');
});

// Send heartbeat message every 30 seconds to keep the connection alive
setInterval(() => {
  if (socket.readyState === WebSocket.OPEN) {
    socket.send('ping');
  }
}, 30000);

P.S. I also had one question which I am not able to find answer to, how to get the price for SENSEX I am not able to find the correct token for it. Please do tell if you know how to get the ltp for sensex.

GaikwadVikas

@muthukumardab Have you implemented NodeJS or JS websocket?
If yes, is it possible to share code?