Iterating through/Parsing JSON Object via JavaScript

Your JSON object is incorrect because it has multiple properties with the same name. You should be returning an array of "student" objects.

[
   {
     "id": 456,
     "full_name": "GOOBER ANGELA",
     "user_id": "2733245678",
     "stin": "2733212346"
   },
   {
     "id": 123,
     "full_name": "BOB, STEVE",
     "user_id": "abc213",
    "stin": "9040923411"
   }
]

Then you can iterate over it as so:

 for (var i = 0, len = objJSON.length; i < len; ++i) {
     var student = objJSON[i];
     $("<div id=\"" + student.id + "\">" + student.full_name + " (" + student.user_id + " - " + student.stin + ")</div>")...
 }

The JSON you have currently will not work because the second "student" effectively replaces the first, since these are just properties in an object.

If you can control the JSON output, change it to:

{
  "student":[{
    "id": 456,
    "full_name": "GOOBER, ANGELA",
    "user_id": "2733245678",
    "stin": "2733212346"
    },{
    "id": 123,
    "full_name": "BOB, STEVE",
    "user_id": "abc213",
    "stin": "9040923411"
  }]
}

Then you have an an array which you can loop over:

for(var i=0; i<objJSON.student.length; i++) {
  ...objJSON.student[i]...
  }

There's a problem with that JSON - the outer curly braces should be square brackets, as you want a list, not a map (aka object). With all objects in the map having the same key, it won't parse right - the last value will overwrite the previous under most parsers.

You want:

[
  {
    "id": 456,
    "full_name": "GOOBER, ANGELA",
    "user_id": "2733245678",
    "stin": "2733212346"
  },
  {
    "id": 123,
    "full_name": "BOB, STEVE",
    "user_id": "abc213",
    "stin": "9040923411"
  }
]

or alternatively a map with different keys:

{
  "456":{
    "id": 456,
    "full_name": "GOOBER, ANGELA",
    "user_id": "2733245678",
    "stin": "2733212346"
  },
  "123":{
    "id": 123,
    "full_name": "BOB, STEVE",
    "user_id": "abc213",
    "stin": "9040923411"
  }
}

You'd be better off using $.getJSON, which is a specialised version of $.ajax for this purpose.

$.getJSON("someurl.com", function(students) {
  $.each(students, function() { 
    $("<div id=\"" + student.id + "\">" + student.full_name + " (" + student.user_id + " - " + student.stin + ")</div>").appendTo($container);
  });
});