What is the method for retrieving all document IDs in MongoDB?

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The method for retrieving all document IDs in MongoDB is by using the find() method with an empty query object. Here is the syntax for the query:

.collection.find({}, {_id: 1})

This will return all documents in the collection with only the id field included. If you want to remove the _id field, you can simply specify {id:0} instead of {_id:1}.