An interesting problem with making a MongoDB GUI is that a key feature of every SQL GUI -- a rich <table> of your data that you can use to see it and play with it -- won't work as well, because MongoDB doesn't have strict table definitions. (Or 'tables' for that matter). Each item in a collection could have completely different fields. So given a big collection of this irregular data, how do you display it compactly? Listing each element in JSON is inefficient.