2nd try at this

app.js

var async = require('async');

var obj = [ "apple", "banana", "orange", "pineapple", "kiwi", "watermelon", "grape" ];

function getObj(i, callback) {
    setTimeout(function() {
        console.log(i)
        callback(null);
    }, 2000);
}

function getUserData(item, callback) {
    setTimeout(function() {
        setTimeout(function() {
            callback(item);
        }, 1000);
    })
}

/*for (var i = 0; i < obj.length; i++) {
    getObj(i, function(data) {
        console.log(data);
    });
}*/


/*async.forEach(obj, getObj, function(err) {
   console.log("done");
});*/

async.forEach(obj,
    function(item, callback) {
        getUserData(item, function(data) {
            console.log(data);

            callback(null);
        });
    },
    function(err) {
        console.log(err + " done");
    }
);