var myString = "Item1";
var jsObject =
{
Item1:
{
"apples": "red",
"oranges": "orange",
},
Item2:
{
"bananas": "yellow",
"pears": "green"
}
};
var keys = Object.keys(jsObject); //get keys from object as an array
keys.forEach(function(key) { //loop through keys array
console.log(key, key == myString)
});