Edit in JSFiddle

var D3PieChart = React.createClass({
  propTypes: {
    width: React.PropTypes.number,
    height: React.PropTypes.number,
    title: React.PropTypes.string,
    data: React.PropTypes.array.isRequired,
  },

  getDefaultProps: function() {
    return {
      width: 300,
      height: 350,
      title: '',
      Legend: true,
    };
  },

  render: function() {
    return (
      <p>Nothing to show yet.</p>
    );
  }
});

var data = [
    {name: "Apples", count: 10},
    {name: "Oranges", count: 20},
    {name: "Bananas", count: 5},
    {name: "Blueberries", count: 42},
    {name: "mangoes ", count: 29}  
];
React.render(<D3PieChart data={data}/>, document.body);

<script src="http://fb.me/react-js-fiddle-integration.js"></script>