JSFiddle - React, Tailwind, and code Playground

HTML

<div id="output"></div>

JavaScript

var json = [
    {
        test : 'foo 1',
        testing : 'bar 1'
    },
    {
        test : 'foo 2',
        testing : 'bar 2'
    },
    {
        test : 'foo 3',
        testing : 'bar 3'
    }
],
    len = json.length,
    output = [];
for ( var i = 0; i < len; i++){
    output += '<hr />index #' + i + '<br />';
    for ( var object in json[i]){
        //here `objects` will be a key
        output.push(json[i].test);
        //if(object=='test')
        //{
        //output += object + ' = ' + json[i][object][object] + '<br />';
        //}
    }
}
$('#output').html(output);