json - How can I traverse this Javascript object?

{ 
       347655082: {
                    album:{

                            title: "A",
                            genre: "Pop",
                          }
        },

        347655083: {

                    album:{
                            title: "B",
                            genre: "Rock", 

                          }
        }
}

Normally the "outside" key is the same, so I can easily target the nested objects.
In the case the "outside" key is variable which can be anything.

albums = JSON.parse(json); //parse json storing it in albums

I cannot run a foreach on albums, say "albums has not method foreach".

albums.forEach(function(album, i){


}

Answer

You can only use .forEach() on arrays. Your albums entity is an Object so you should use for ... in ...)

for (var key in albums) {
    if (albums.hasOwnProperty(key)) {
        // do something with albums[key]
        ...
    }
}

For code targetting node.js or any other ES5 implementation you could probably omit the if clause - it's only needed if you've got code that has unsafely added stuff to Object.prototype.