JSFiddle - React, Tailwind, and code Playground

JavaScript

var myObject = {
    foo: 'a',
    bar: 'b',
    otherthings: [{
        yep: '0',
        yuk: 'yoyo0'
    }, {
        yep: '1',
        yuk: 'yoyo1'
    }],
    foobar: 'yup',
    value: null
};

var myStringObject = JSON.stringify(myObject);
var matches = myStringObject.match('yep');


alert(matches.length);