I have a situation where I want to run an endless loop and I have to get data from there. For this, I have to make a Http call and then put the http response in a database, In each iteration, I have to wait for some second.

To solve this problem I am using async module.

For this below is the code by using async.forever.

var async = require("async");
var http = require("http");

//Delay of 5 seconds
var delay = 5000;

async.forever(

    function(next) {

        http.get({
            host: "google.com",
            path: "/"
        }, function(response) {

            // Continuously update stream with data
            var body = "";

            response.on("data", function(chunk) {
                body += chunk;
            });

            response.on("end", function() {

                //Store data in database
                console.log(body);

                //Repeat after the delay
                setTimeout(function() {
                    next();
                }, delay)
            });
        });
    },
    function(err) {
        console.error(err);
    }
);

In above code, I have used async.forever and after getting a response we will store data in a database and perform any action which we want to perform.