Un-nesting array of object in JavaScript?

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' }
]

AmitDiwan

Published on 07-Sep-2020 08:28:18

• Related Questions & Answers
• Array Nesting in C++
• Nesting template strings in JavaScript
• JavaScript - How to create nested unordered list based on nesting of array?
• Convert array of object to array of array in JavaScript
• Nesting Columns in Bootstrap
• Object to array - JavaScript
• Replacing array of object property name in JavaScript
• Convert object of objects to array in JavaScript
• Convert object to array of objects in JavaScript
• Sum of array object property values in new array of objects in JavaScript
• Sort object array based on another array of keys - JavaScript
• JavaScript Converting array of objects into object of arrays
• Sum of nested object values in Array using JavaScript
• Converting array of objects to an object in JavaScript
• Converting array of arrays into an object in JavaScript