How to delete multiple ids in mongodb?

You can accomplish this by using the command deleteMany.

const objects = [
    ObjectId("51ee3966e4b056fe8f074f48"), 
    ObjectId("51ee3966e4b056fe8f074f4a"), 
    ObjectId("51ee3966e4b056fe8f074f4b") 
];

db.collection.deleteMany({_id: { $in: objects}});

By running remove once for each ID, or perhaps using in:

db.collection.remove( { _id : { $in: [
    ObjectId("51ee3966e4b056fe8f074f48"), 
    ObjectId("51ee3966e4b056fe8f074f4a"), 
    ObjectId("51ee3966e4b056fe8f074f4b") 
] } } );