How do you query for “is not null” in Mongo?

Question

I would like to execute a following query:

db.mycollection.find(HAS IMAGE URL)

What should be the correct syntax?

Answer 1

In an ideal case, you would like to test for all three values, null, "" or empty(field doesn't exist in the record)

You can do the following.

db.users.find({$and: [{"name" : {$nin: ["", null]}}, {"name" : {$exists: true}}]})