How do I delete a field from a MongoDB collection by key?

Question

I have a MongoDB database with a settings collection that I need to delete a field from by key. In the docs I see that deleteOne accepts an Object [key, value].

How can I delete it with just the key since the value is unknown?

// key - req.params.key
db.collection('settings').deleteOne(???);

Answer 1

If I understand you question correctly. You want to delete a document where a particular field exists?

If so you can use the $exists element query operator.

Let's say the field name is config .

db.collection('settings').deleteOne({config: {$exists: true}})

Here is the source documentation: https://docs.mongodb.com/manual/reference/operator/query/exists/