Accessing inner element of JSON array in MongoDB?

To access inner element of JSON array in MongoDB, use dot notation. Let us create a collection with documents −

> db.demo687.insert({CountryName:'US', ... info: ... { ... id:101, ... details: ... [ ... { ...    Name:'Chris', ...    SubjectName:'MongoDB', ...    otherDetails:{ ...       "Marks":58, ...       Age:23 ...    } ... } ... ] ... } ... } ... ) WriteResult({ "nInserted" : 1 }) > db.demo687.insert({CountryName:'UK', ... info: ... { ... id:102, ... details: ... [ ... { ...    Name:'David', ...    SubjectName:'MySQL', ...    otherDetails:{ ...       "Marks":78, ...       Age:21 ...    } ... } ... ] ... } ... } ... ) WriteResult({ "nInserted" : 1 })

Display all documents from a collection with the help of find() method −

> db.demo687.find();

This will produce the following output −

{ "_id" : ObjectId("5ea55658a7e81adc6a0b3962"), "CountryName" : "US", "info" : { "id" : 101, "details" : [ { "Name" : "Chris", "SubjectName" : "MongoDB", "otherDetails" : { "Marks" : 58, "Age" : 23 } } ] } } { "_id" : ObjectId("5ea55673a7e81adc6a0b3963"), "CountryName" : "UK", "info" : { "id" : 102, "details" : [ { "Name" : "David", "SubjectName" : "MySQL", "otherDetails" : { "Marks" : 78, "Age" : 21 } } ] } }

Following is the query to access inner element of JSON array −

> db.demo687.find({"info.details.otherDetails.Marks":58});

This will produce the following output −

{ "_id" : ObjectId("5ea55658a7e81adc6a0b3962"), "CountryName" : "US", "info" : { "id" : 101, "details" : [ { "Name" : "Chris", "SubjectName" : "MongoDB", "otherDetails" : { "Marks" : 58, "Age" : 23 } } ] } }