JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://cdn.sencha.io/ext-4.1.1a-gpl/resources/css/ext-all.css">
<div id='grid'></div>

JavaScript

Ext.define('User', {
    extend: 'Ext.data.Model',
    fields: ['type', 'device']
});

Ext.onReady(function() {
    var myData = '{"data":[{"name":"machine1","devices":{"disk":[{"type":"file","device":"disk"},{"type":"block","device":"cdrom"}]}},{"name":"machine2","devices":{"disk":[{"type":"file","device":"disk"},{"type":"block","device":"cdrom"}]}}]}';

    var store = Ext.create('Ext.data.Store', {
        model: 'User',
        data: Ext.decode(myData),
        proxy: {
            type:'memory',
            reader: {
                type:'json',
                root: 'data[0].devices.disk'
            }
        }
    });

    Ext.create('Ext.grid.Panel', {
        store: store,
        stateful: true,
        collapsible: true,
        multiSelect: true,
        stateId: 'stateGrid',
        columns: [
            {
                text     : 'type',
                dataIndex: 'type'
            },
            {
                text     : 'device',
                dataIndex: 'device'
            }
        ],
        height: 350,
        width: 600,
        title: 'Array Grid',
        renderTo: 'grid',
        viewConfig: {
            stripeRows: true,
            enableTextSelection: true
        }
    });
});