Mongo DB find by field name with any value

Question

I am trying to find all documents that have this field, it doesn\'t matter what exact value it contains; I am only interested in the existence of it.

Here is an exam

Answer 1

You're probably looking for the $exists operator:

db.collection.find({ "payload.discount": { $exists: true } })

Answer 2

There's a $exists operator for that:

db.collectionName.find({"payload.discount": {$exists: true}})