To access nested JSON property based on another property’s value, the code is as follows −
Example
var actualJSONData = JSON.parse(studentDetails()), studentMarks = getMarksUsingSubjectName(actualJSONData, "JavaScript"); console.log("The student marks="+studentMarks); function getMarksUsingSubjectName(actualJSONData, givenSubjectName){ for(var tempObj of actualJSONData){ if(tempObj.subjectName = givenSubjectName){ return tempObj.marks; } } } function studentDetails(){ return JSON.stringify( [ { firstName : "John", subjectName: "JavaScript", marks : 97 }, { firstName : "David", subjectName: "Java", marks : 98 } ] ); }
To run the above program, you need to use the following command −
node fileName.js.
Here, my file name is demo155.js.
Output
This will produce the following output −
PS C:\Users\Amit\JavaScript-code> node demo155.js The student marks=97