get data array in mongodb code example

Example 1: how to get array object value in mongodb

db.products.aggregate([
    {$unwind: "$ratings"},
    {$match: {'ratings.user': ObjectId("5f6e2e0b70eb0208fc8401a1")}}
])

Example 2: fetching data from inside an array in mongodb

db.users.find( { name: "John"}, { items: { $elemMatch: { item_id: "1234" } } })