mongo find one match out of an array of objects code example

Example 1: how to get array object value in mongodb

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

Example 2: mongodb find element in array

db.yourCollection.find( { array: "element" } )