Send published Message to Browser or Clients interface one who subscribed to the channel NodeJS

How do I separate the code of publish and subscribe as Client.js and Server.js code? Also, how do I print the message on browser and not in console? Do I really need to use web sockets to push data to browser? like: Send message from Node.js Server to Client via function call

how do I pass it in routes:

router.get('/api', function(req, res, next) {
  res.render('index', { data: data });
}); 

app.js

var main = require("./server");

server.js

var http = require("http");
var fs = require("fs");
var PubNub = require("pubnub");
var connect = require("connect");

function server404Response (response) {
    response.writeHead(404,{'contentType':'text/plain'});
    response.write("404, Page Not Found Error");
    response.end();
}

function onRequest(request,response) {
    if(request.method == 'GET' && request.url == '/'){
        publish();
        response.writeHead(200,{'contentType':'text/html'});
        fs.createReadStream("./index.html").pipe(response);

    }else{
        server404Response(response);
    }
}

http.createServer(onRequest).listen(8888);
console.log("Server is running");   

function publish() {

    pubnub = new PubNub({
        publishKey : 'pub-key',
        subscribeKey : 'sub-key'
    })

    var publishConfig = {

        channel : "test",
        message : "Hello from PubNub Docs!"
    }

    pubnub.addListener({
        status: function(statusEvent) {

            if (statusEvent.category === "PNConnectedCategory") {
                pubnub.publish(publishConfig);
               }
        },
        message: function(message) {
            console.log("New Message!!", message);
        },
        presence: function(presenceEvent) {
            // handle presence
        }
    })
    //if I add subscribe code here. it just works fine
};

client.js

var PubNub = require("pubnub");

pubnub = new PubNub({
    publishKey : 'pub-key',
    subscribeKey : 'sub-key'
})

console.log("Subscribing..");
pubnub.subscribe({
    channels: ['test']
});

via Murlidhar Fichadia