app.get('/courses', function (req, res) {
    var id = req.param('id'); // some variable from request
    var coursesResponse = getCourses(id); // example for getting courses

    if (!!courses && courses.length >= 0) { // if courses isn't undefined and length is greater >= 0 (example condition)

        // most important function
        res.json({
            success: true,
            courses: coursesResponse
        });
    } else {
        res.status(500).json({
            success: false,
            message: 'Internal server error while fetching courses'
        })
    }

    }
)


// on client side. using jquery

// make a ajax request first and then parse the data
var courses = $.parseJSON(data);

// now loop through the courses array and show the values of array in a div with id 'courses'.
$.each(courses, function(index, value) {
    $("#courses").append("<p>" + value.courseCode + " -- " + value.courseTitle + "</p>");
});