search for diff in two JSON
function getDifference(o1, o2) {
var diff = {};
var tmp = null;
if (JSON.stringify(o1) === JSON.stringify(o2)) return;
for (var k in o1) {
if (Array.isArray(o1[k]) && Array.isArray(o2[k])) {
tmp = o1[k].reduce(function (p, c, i) {
var _t = getDifference(c, o2[k][i]);
if (_t)
p.push(_t);
return p;
}, []);
if (Object.keys(tmp).length > 0)
diff[k] = tmp;
} else if (typeof (o1[k]) === "object" && typeof (o2[k]) === "object") {
tmp = getDifference(o1[k], o2[k]);
if (tmp && Object.keys(tmp) > 0)
diff[k] = tmp;
} else if (o1[k] !== o2[k]) {
diff[k] = o2[k]
}
}
return diff;
}