How do I make a World loader in multiplayer?

For a better vision on what I am trying to do:

It's possible to make a 'world loader' in multiplayer?

It would something like the Minecraft one, when you join a server and you download the map and the map is sync to detect every block that was broke and placed.

Is it possible????

It is definitely possible, how you do it - depends on what you're using, web sockets, ajax, e.t.c.

Core idea - you can save world map state as an array converted to json , or other JSON , or XML, or CSV or any other format and than transfer it via your's multiplayer connection.