Initate Socket connection with Twelvedata server in node js答案

【问题标题】：Initate Socket connection with Twelvedata server in node jsInitate Socket connection with Twelvedata server in node js
【发布时间】：2022-12-27 08:00:35
【问题描述】：


import * as dotenv from 'dotenv' 
import WebSocket from 'ws';

//setting up env
dotenv.config()


// setting up the websocket
const ws = new WebSocket(`wss://ws.twelvedata.com/v1?symbol=AAPL?apikey=${process.env.API_KEY_TWELVEDATA}`);

ws.on('subscribe', (stream) => {
  console.log('stream ==>', stream);
})

I cannot emit subscribe event given by the twelvedata API. Also, I don't know how to pass the parameters as suggested by the twelvedata's documentation in node js.

For Example:-



{ "action": "subscribe", 
  "params": {
    "symbols": [{
        "symbol": "AAPL",
        "exchange": "NASDAQ"
      }, {
        "symbol": "RY", 
        "mic_code": "XNYS"
      }, {
        "symbol": "DJI",
        "type": "Index"
      }
  ]
 }
}

This object is used as a parameter to emit event to the twelvedata server and the server then responds with the data stream.

How can I emit the subscribe event through web-sockets as stated by the below screenshot (this is an example from the twelvedata website)

How can I pass the information regarding the subscribe event and the parameters to the web socket as shown in the screenshots

【问题讨论】：

标签： node.js express websocket ws twelvedata

【解决方案1】：

The websocket subscribe event is performed via the send function, rather than as an on listener.

this.ws.send(JSON.stringify(subObject));

And when the server sends you information, you would listen to it via message

        this.ws.on('message', async (msg) =>{
        let buffToJson = JSON.parse(msg.toString('utf8'))
        
        if(buffToJson.event === 'price'){

【讨论】：