With json.net, is there a shortish way to manipulate all string fields?

Question

Given an arbitrary Newtonsoft.Json.Linq.JObject, if you want to apply some function to all string values that appear in it (wherever that may be) - whether as a basic value

Answer 1

One simple way to do this is to use JContainer.DescendantsAndSelf() to find all descendants of the root JObject that are string values, then replace the value with a remapped string using JToken.Replace():

public static class JsonExtensions
{
    public static JToken MapStringValues(this JContainer root, Func<string, string> func)
    {
        foreach (var value in root.DescendantsAndSelf().OfType<JValue>().Where(v => v.Type == JTokenType.String).ToList())
            value.Replace((JValue)func((string)value.Value));
        return root;
    }
}

Then use it like:

jObj.MapStringValues(s => "remapped " + s);