To un-nest array of objects, use the concept of map(). Let’s say the following are our array of objects −
const studentDetails = [ { "studentId": 101, "studentName": "John", "subjectDetails": { "subjectName": "JavaScript" } }, { "studentId": 102, "studentName": "David", "subjectDetails": { "subjectName": "MongoDB" } } ];
We need to un-nest the subjectName and display the result. Following is the code −
Example
const studentDetails = [ { "studentId": 101, "studentName": "John", "subjectDetails": { "subjectName": "JavaScript" } }, { "studentId": 102, "studentName": "David", "subjectDetails": { "subjectName": "MongoDB" } } ]; const output = studentDetails.map(obj => ({ studentId: obj.studentId, studentName: obj.studentName, subjectName:obj.subjectDetails.subjectName })); console.log(output);
To run the above program, you need to use the following command −
node fileName.js.
Output
Here, my file name is demo92.js. This will produce the following output −
PS C:\Users\Amit\JavaScript-code> node demo92.js [ { studentId: 101, studentName: 'John', subjectName: 'JavaScript' }, { studentId: 102, studentName: 'David', subjectName: 'MongoDB' } ]