How to update values into appsetting.json?

Question

I am using the IOptions pattern as described in the official documentation.

This works fine when I am reading values from appsetting.json,

Answer 1

public static void SetAppSettingValue(string key, string value, string appSettingsJsonFilePath = null) {
 if (appSettingsJsonFilePath == null) {
  appSettingsJsonFilePath = System.IO.Path.Combine(System.AppContext.BaseDirectory, "appsettings.json");
 }

 var json = System.IO.File.ReadAllText(appSettingsJsonFilePath);
 dynamic jsonObj = Newtonsoft.Json.JsonConvert.DeserializeObject < Newtonsoft.Json.Linq.JObject > (json);

 jsonObj[key] = value;

 string output = Newtonsoft.Json.JsonConvert.SerializeObject(jsonObj, Newtonsoft.Json.Formatting.Indented);

 System.IO.File.WriteAllText(appSettingsJsonFilePath, output);
}