@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.