Hi, i have a question. How to get only password for specific user via mongodb? I read arictle "Database Structure", but whatever can't understand.
Do you mean the password hash? The password is not stored in the database, nor anywhere else.
@yariplus yep, I meant password hash. How get password hash for a user?
db.objects.find({_key:"user:1"});
A bit of explanation here. NodeBB was not originally designed for mongodb, thus does not use mongo collections. Every object is stored in one large "objects" collection, and is indexed by a unique string stored in the _key field. For user objects this key is user:UID, where UID is the user's identifier.
If you wanted to look up just the password field (the password hash), you can use query projection as such:
db.objects.find({_key:"user:1"}, {password: true, _id: false})
and you can add other fields as such:
db.objects.find({_key:"user:1"}, {password: true, uid: true, email: true, username: true, _id: false})
@yariplus oh, that's what I was looking for. Thank you! 
Sorry, but I have another question. Can i do a query that is show all users and their password hashes?
Sure. You can use regular expression syntax instead of a string to match all users.
db.objects.find({_key: /^user:\d+$/}, {password: true, username: true, _id: false})
Oh, thanks a lot for your helping.
