getFlatObject.js

  function getFlatObject(object) {
    function iter(o, p) {
        if (Array.isArray(o) ){
            o.forEach(function (a, i) {
                iter(a, p.concat(i));
            });
            return;
        }
        if (o !== null && typeof o === 'object') {
            Object.keys(o).forEach(function (k) {
                iter(o[k], p.concat(k));
            });
            return;
        }
        path[p.join('.')] = o;
    }

    var path = {};
    iter(object, []);
    return path;
}

var obj = { one: 1, two: { three: 3 }, four: { five: 5, six: { seven: 7 }, eight: 8 }, nine: 9 },
    path = getFlatObject(json1);
	
console.log(path);