How to make multiple http calls from the nodejs server with a common callback?

Question

I want to make multiple http calls in nodejs sever with common callback. Is there any modules available for doing it?

Answer 1

You can use async library or underscore.

I often use underscore for this. Assuming you are making n http calls

var http_done = _.after(n, function() {
   // final callback
});

for... {
  ajax_call(..., function(response) {
     // Do something with response
     http_done();
  });
}

Answer 2

I have used this Async NPM to solve this. https://www.npmjs.com/package/async

async.parallel([
        function(callback){
             callback(null,1)
        },
        function(callback){
             callback(null,2)
        },      
    ],
    function(err, results){

       console.log(results); //Output [1,2]

    });