Get all keys of a deep object in Javascript

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You can do this by recursively traversing the object:

function getDeepKeys(obj) {
    var keys = [];
    for(var key in obj) {
        keys.push(key);
        if(typeof obj[key] === "object") {
            var subkeys = getDeepKeys(obj[key]);
            keys = keys.concat(subkeys.map(function(subkey) {
                return key + "." + subkey;
            }));
        }
    }
    return keys;
}

Running getDeepKeys(abc) on the object in your question will return the following array:

["1", "2", "3", "4", "5", "5.test", "5.tester", "5.tester.name", "count", "counter", "counter.count"]

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