JSFiddle - React, Tailwind, and code Playground

JavaScript

var json = '[ { "revision_uid":"1", "body":{ "und":[ { "value":"Blah Blah.", "summary":"", "format":null, "safe_value":"Blah Blah.", "safe_summary":"" } ] }, "event_calendar_date":{ "und":[ { "value":"2015-07-20 14:00:00", "value2":"2015-07-20 20:00:00", "timezone":"America/New_York", "timezone_db":"America/New_York", "date_type":"datetime" } ] } } ]';
var data = JSON.parse(json);
//var content = data[0];
//console.log(content.event_calendar_date.und[0].value);

for (var i = 0; i < data.length; i++) {
            var content = data[i];
            console.log(content.event_calendar_date.und[0].value);
        };