Example to parse a full tick from Kite Websocket.

parseTick.ts

// Tick structure reference: https://kite.trade/docs/connect/v3/websocket/#message-structure
const parseBinary = (dataView: DataView) => {
  const numberOfPackets = dataView.getInt16(0);
  let index = 4;
  const ticks: { token: number; firstBid: number; firstAsk: number }[] = [];

  for (let i = 0; i < numberOfPackets; i++) {
    const size = dataView.getInt16(index - 2);

    // Parse whatever you need
    ticks.push({
      token: dataView.getInt32(index),
      firstBid: dataView.getInt32(index + 68) / 100,
      firstAsk: dataView.getInt32(index + 128) / 100,
    });

    index = index + 2 + size;
  }

  return ticks;
};

const API_KEY = 'INSERT_API_KEY_HERE';
const ACCESS_TOKEN = 'INSERT_ACCESS_TOKEN_HERE';

const ws = new WebSocket(
  `wss://ws.kite.trade?api_key=${API_KEY}&access_token=${ACCESS_TOKEN}`
);

ws.onopen = (_event) => {
  console.log('Connected to Zerodha Kite Socket!');

  const setModeMessage = { a: 'mode', v: ['full', [61512711]] };
  ws.send(JSON.stringify(setModeMessage));
};

ws.onerror = (error) => {
  console.log('Some error occurred', error);
};

ws.onmessage = async (message) => {
  if (message.data instanceof Blob && message.data.size > 2) {
    const arrayBuffer = await message.data.arrayBuffer();
    const dataView = new DataView(arrayBuffer);
    const ticks = parseBinary(dataView);
    console.log(ticks);
  }
};

export {};