convert json keys to lowercase recursively.

keysToLowerCase.js

/**
 * Created by gonchub on 19/03/14.
 */
function keysToLowerCase(obj) {
    if (!typeof(obj) === "object" || typeof(obj) === "string" || typeof(obj) === "number" || typeof(obj) === "boolean") {
        return obj;
    }
    var keys = Object.keys(obj);
    var n = keys.length;
    var lowKey;
    while (n--) {
        var key = keys[n];
        if (key === (lowKey = key.toLowerCase()))
            continue;
        obj[lowKey] = keysToLowerCase(obj[key]);
        delete obj[key];
    }
    return (obj);
}

Thank you very much. It's help me.

You should prepend the following code in order to handle arrays in object

if(obj instanceof Array) {
    for (var i in obj) {
        obj[i] = keysToLowerCase(obj[i]);
    }
}