MongoDB select where in array of _id?

Question

is possible in mongo db to select collection\'s documents like in SQL :

SELECT * FROM collection WHERE _id IN (1,2,3,4);

or if i have a

Answer 1

Because mongodb uses bson and for bson is important attribute types. and because _id is ObjectId you must use like this:

db.collection.find( { _id : { $in : [ObjectId('1'),ObjectId('2')] } } );

and in mongodb compass use like this:

{ "_id" : { $in : [ObjectId('1'),ObjectId('2')] } }

Note: objectId in string has 24 length.