creating nested json file in node js - node.js

Question

Here I want to create a nested json file. I have a variable loggedPerson1 as string which takes username of the person who have logged in and that person selects the courses. I want to create the json file in such a manner that registered courses would come under that name of that user.
var exists = fs.existsSync('RegisteredCourses.json');
if(exists) {
console.log("Loading");
var data = fs.readFileSync('RegisteredCourses.json', 'utf-8');
objRegister = JSON.parse(data);
}
else {
console.log('created new ')
var objRegister = {loggedPerson1:[]};
}
app.get('/RegisteredCourses',(req,res) =>{
res.send(loggedPerson)
})
app.post('/RegisteredCourses',(req,res) =>{
var declaredCourse =
{
key: Date.now().toString(),
CourseName : req.body.CourseName,
CourseCode: req.body.CourseCode,
StartDate:req.body.StartDate,
EndDate:req.body.EndDate,
Total_Fee: req.body.Fees,
Delivery_Mode : req.body.Delivery_Mode,
Description : req.body.Description,
CourseType: req.body.CourseType
}
if(!declaredCourse.CourseName ){
reply ={
msg:"Please enter data correctly"
}
res.send(reply)
}
else{
objRegister.loggedPerson1.push(declaredCourse)
let data = JSON.stringify(objRegister, null, 2);
fs.writeFile('RegisteredCourses.json',data,finished);
console.log('RegisteredCourses updated')
function finished(err){
reply = {
status:"Success",
}
res.send(reply)
console.log(reply)
}
}
})

Answer 1

It's not clear whether you're looking for the structure of the JSON here or something else. The JSON structure could be something like:
{
"students": {
"studentName": "Person 1",
"Courses": {
"one": "one",
"two": "two"
}
}
}
your code to read it out with:
var data = fs.readFileSync('RegisteredCourses.json', 'utf-8');
objRegister = JSON.parse(data);
should work fine, i've used the same in my projects.