How to view document fields in mongo shell?

Question

Is there a way to figure out the fields/keys in a document while in mongo\'s shell? As an example, let\'s say we have a document like (pseudocode):

{
    \"m         


        

Answer 1

A for ... in loop should do the trick:

> var message = db.messages.findOne();
> for (var key in message) {
... print(key);
... }