JSFiddle - React, Tailwind, and code Playground

JavaScript

var val = 'foo',
    val2 = 'bar';

var obj = { prop1:val, prop2:val2 };

var findVal = function(o, v) {
    return new RegExp(':\"'+v+'\"').test(JSON.stringify(o));
};

console.log( findVal(obj, val) );