How to write certain contents in a Json file?

Here is my code which displays the contents profi.json
And below the contents of the Json
The question how to deduce not all but only the content for example "shopperName": "Ivan Ivanov",
And record in another DATA file.json

And another question
How to make reading multiple JSON files and after overwriting in the DATA.json namely, adding in the same file

var fs = require('fs');
var file = __dirname + '/profi.json';

fs.readFile(file, 'utf8', function (err, data) {

 if (err) {
 console.log('Error:' + err);
return;
}


data = JSON.parse(data);
console.dir(data);
});


{
 "orderID": 12345,
 "shopperName": "Ivan Ivanov",
 "shopperEmail": "ivanov@example.com",
 "contents": [
{
 "productID": 34,
 "productName": "Super product",
 "quantity": 1
},
{
 "productID": 56,
 "productName": "Miracle goods",
 "quantity": 3
}
],
 "orderCompleted": true
}
June 3rd 19 at 19:12
1 answer
June 3rd 19 at 19:14
console.log(data[shopperName]);

// Another json file
data2 = JSON.parse(data2)
data2[shopperName] = data[shopperName]

Find more questions by tags Node.jsJSON