How to print an object on page?

I think your example should work. Not sure what kind of representation you are hoping for but I put an example on jsfiddle where I use JSON.stringify to print out an object.

https://jsfiddle.net/5yq9fev6/1/

var world = {
    'abc' : [1, 2, 3],
    'b': {
        1: 'c'
     }
}

var Hello = React.createClass({
    render: function() {
        return (
            <div>        
                <div>{JSON.stringify(world)}</div>
            </div>
        )
    }
});

React.render(<Hello />, document.getElementById('container'));