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

It was interesting task for me, so this is what i have written

class Program
{
    static void Main(string[] args)
    {
        string jsonFilePath = @"test.json"; //path to your json
        string json = File.ReadAllText(jsonFilePath);
        var data = JObject.Parse(json);
        CheckJson(data);
        Console.ReadLine();
    }

    static void CheckJson(JToken value)
    {
        if (value.Values().Count() != 0) //if more than 0 - so value is object or array and we have to call this method for each property
        {
            foreach (var item in value.Values().ToList())
            {
                CheckJson(item);
            }
        }
        else if (true) //else - we have exactly value of key, which we can check, for example if . exists or additional checks
        {
            if (value.Parent.Parent is JObject jObject && jObject["validate"] == null) //check if above "required" property exists 
            {
                jObject.Add("validate", JObject.FromObject(new { required = true })); //add required property
            }
        }

    }
}

This code will add in each object property "required" if it is not exists. All you need - just add Validation method and call it in if block. And better to add additional validation that won't continue checking all properties if "required" property exists