(Node.js) Read Bitfinex WebSocket Ticker Channel

Subscribes to the public Bitfinex websocket ticker channel and receives ticker updates.

Install Chilkat for Node.js and Electron using npm at Chilkat npm packages for Node.js Chilkat npm packages for Electron on Windows, Linux, MacOSX, and ARM

var os = require('os');
if (os.platform() == 'win32') {  
    if (os.arch() == 'ia32') {
        var chilkat = require('@chilkat/ck-node21-win-ia32');
    } else {
        var chilkat = require('@chilkat/ck-node21-win64'); 
    }
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('@chilkat/ck-node21-arm');
    } else if (os.arch() == 'x86') {
        var chilkat = require('@chilkat/ck-node21-linux32');
    } else {
        var chilkat = require('@chilkat/ck-node21-linux64');
    }
} else if (os.platform() == 'darwin') {
    if (os.arch() == 'arm64') {
        var chilkat = require('@chilkat/ck-node21-mac-m1');
    } else {
        var chilkat = require('@chilkat/ck-node21-macosx');
    }
}

function chilkatExample() {

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    var ws = new chilkat.WebSocket();

    // For brevity, this example does not check for errors when etablishing the WebSocket connection.
    // See Establish WebSocket Connection for more complete sample code for making the connection.

    var rest = new chilkat.Rest();

    // Connect to api.bitfinex.com
    var success = rest.Connect("api.bitfinex.com",443,true,false);
    ws.UseConnection(rest);
    ws.AddClientHeaders();

    var responseBody = rest.FullRequestNoBody("GET","/ws");
    success = ws.ValidateServerHandshake();
    if (success !== true) {
        console.log(ws.LastErrorText);
        console.log(responseBody);
        console.log(rest.ResponseHeader);
        return;
    }

    // After connecting, the bitfinex websocket server will send
    // an info message that contains the actual version of the websocket stream.
    // Receive that message..
    success = ws.ReadFrame();
    if (success !== true) {
        console.log("Failed to receive a frame");
        console.log("ReadFrame fail reason = " + ws.ReadFrameFailReason);
        console.log(ws.LastErrorText);
        return;
    }

    // We should get this:
    // {"event":"info","version":1.1,"platform":{"status":1}}
    console.log(ws.GetFrameData());

    // Subscribe to the public ticker feed.
    // See https://docs.bitfinex.com/docs for more information.
    var json = new chilkat.JsonObject();
    json.AppendString("event","subscribe");
    json.AppendString("channel","ticker");
    json.AppendString("pair","BTCUSD");

    var finalFrame = true;
    success = ws.SendFrame(json.Emit(),finalFrame);

    // Read the response.
    success = ws.ReadFrame();
    if (success !== true) {
        console.log("Failed to receive a frame");
        console.log("ReadFrame fail reason = " + ws.ReadFrameFailReason);
        console.log(ws.LastErrorText);
        return;
    }

    // Examine the response
    // We should get this:
    // {"event":"subscribed","channel":"ticker","chanId":2751,"pair":"BTCUSD"}
    console.log(ws.GetFrameData());

    // Begin reading the ticker feed.
    // We'll just read the 1st 5 updates and then exit..
    var receivedFinalFrame = false;
    var numUpdatesReceived = 0;
    while (numUpdatesReceived < 5) {

        success = ws.ReadFrame();
        if (success !== true) {
            console.log("Failed to receive a frame");
            console.log("ReadFrame fail reason = " + ws.ReadFrameFailReason);
            console.log(ws.LastErrorText);
            return;
        }

        // The responses we desire are in Text frames, where the opcode = 1.
        if (ws.FrameOpcodeInt == 1) {
            var receivedText = ws.GetFrameData();
            console.log(receivedText);
            // Should receive a line of text such as this:
            // [2751,7349,36.34269559,7349.1,41.01777063,-116.2,-0.0156,7349.1,22188.26055319,7560,7270.5]
            numUpdatesReceived = numUpdatesReceived+1;
        }

    }

    // Close the websocket connection.
    success = ws.SendClose(true,1000,"Closing this websocket.");
    if (success !== true) {
        console.log(ws.LastErrorText);
        return;
    }

    // Read the Close response.
    success = ws.ReadFrame();
    if (success !== true) {
        console.log("ReadFrame fail reason = " + ws.ReadFrameFailReason);
        console.log(ws.LastErrorText);
        return;
    }

    console.log("Success.");

}

chilkatExample();