Extract key value from a nested object in JavaScript?

Let us first create a nested object −

var details = {    "teacherDetails":    {       "teacherName": ["John", "David"]    },    "subjectDetails":    {       "subjectName": ["MongoDB", "Java"]    } }

Let us now extract the keys. Following is the code −

Example

var details = {    "teacherDetails":    {       "teacherName": ["John", "David"]    },    "subjectDetails":    {       "subjectName": ["MongoDB", "Java"]    } } var objectName, nestedObject; var name = "Java"; for(var key in details){    for(var secondKey in details[key]){       if(details[key][secondKey].includes(name)){          objectName = key;          nestedObject = secondKey;       }    } } console.log(objectName + ', ' + nestedObject);

To run the above program, you need to use the following command −

node fileName.js.

Here, my file name is demo96.js.

Output

This will produce the following output −

PS C:\Users\Amit\JavaScript-code> node demo96.js subjectDetails, subjectName