title: Reading JSON file with AJAX and storing data to an array
body: <p>All I am trying to do is reading an JSON file with data format as shown below and extract only id from nodes and store it in an array.</p>
  
  <pre><code>{"nodes":[
  {"id":"1057457211927117824", "age":"20", "name":"a", "loaded":true},
  {"id":"1057459284189970433", "age":"20", "name":"b", "loaded":true}
  ]
  "links":[
  {"id":"l01", "from":"1057457210467540992", "to":"1057455883972722689", "type":"friend"},
  {"id":"l02", "from":"1057457271331057664", "to":"1057451606344646656", "type":"friend"}
  ]}
  </code></pre>
  
  <p>Below is the code I tried but its not working.</p>
  
  <pre><code>var node_id = []; 
  $.getJSON("data/newData.json", function (data) {
      $.each(data, function (index, value) {
          node_id.push(value[0]['id']); 
      });
  });
  </code></pre>