how to select item in array in mongodb code example

Example 1: mongodb find element in array

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

Example 2: mongodb find array with element

// Finds all documents that have a property named "tags"
// which has at least one array element matching "red"
db.inventory.find( { tags: "red" } )

Example 3: find string element in an array mongodb

db.articles.find({
    "stock.country" : "01",
    "stock.warehouse.code" : "02"
}).pretty();