使用 Javascript 更新 json 文件中的 json 密钥？

Question

I have a JSON file, I need to read that JSON file and update a particular key with new values. How can I do it with the help of javascript in the typescript file?

datafile.json:

{
   "Id": {
       "place": {
           "operations": [{
               "Name": "John",
               "Address": "USA"
           }]
       }
   }
}

Now in my test.ts file

const filepath = 'c:/datafile.json';
var testjson = filepath.Id[place][operations][0];
var mykey = 'Address';

//testjson[mykey] = 'UK';

updateJsonFile(filepath, (data) => {
  data[mykey] = 'UK';
  console.log(data);
  return data;
});

The issue is it update the JSON with new key and values as below:

{
    "Id": {
        "place": {
            "operations": [{
                "Name": "John",
                "Address": "USA"
            }]
        }
        "Address": "UK"
    }
}

But I want to just change the value of a particular key then adding new keys. Is it possible in JS.?

Answer 1

data doesn't have an Address property, its operations , which is inside place .

If you try to set it like

data[mykey] = 'UK';

it will create a new property to data ,

It should be

o.Id.place.operations[0][mykey] = 'UK';

 jsonString = ` { "Id": { "place": { "operations": [{ "Name": "John", "Address": "USA" }] } } } `; let o = JSON.parse(jsonString); var mykey = 'Address'; o.Id.place.operations[0][mykey] = 'UK'; console.dir(o);