tra <code>$$hashKey</code> to your objects.</p>
    <h5>With <code>track by $index</code></h5>
    <div class="result">
      <json-formatter ng-repeat="item in randArray1 track by $index" json="item"></json-formatter>
    </div>
    <h5>Without <code>track by $index</code></h5>
    <div class="result">
      <json-formatter ng-repeat="item in randArray2" json="item"></json-formatter>
    </div>

    <h4>Dark theme</h4>
    <p>To use dark theme add <code>json-formatter-dark</code> class this directive. Note