How to add properties at runtime to JSON (C#)

Question

Note: Im working with System.Text.Json package Below is JSON I am getting from a database. I have to go through each of the keys in the JSON and check if there is a period (

Answer 1

One of the options would be to parse json into JObject and add property to it via Newtonsoft's Json.NET:

var obj = JObject.Parse("{'key':'value'}");
obj.Add("required", true);
Console.WriteLine(obj); // { "key": "value", "required": true }

To add new object you can use this overload of Add:

obj.Add("validate", JObject.FromObject(new { required = true }));

So the whole solution will look something like this:

var obj = JObect.Parse(your_json);

foreach(var token in obj.DescendantsAndSelf().ToList()) // ToList is important!!!
{
    if(token is JObject xObj)
    {
        // check your conditions for adding property
        // check if object does not have "validate" property
        if(satisfies_all_conditions)
        {
            xObj.Add("validate", JObject.FromObject(new { required = true }));
        }
    }
}