JSON.NET how to remove nodes

Question

I have a json like the following:

{   "d": {     "results": [       {         "__metadata": {         },         "prop1": "value1",         "prop2": "value2",         "__some": "value"       },       {         "__metadata": {         },         "prop3": "value1",         "prop4": "value2",         "__some": "value"       },     ]   } } 

I just want to transform this JSON into a different JSON. I want to strip out the "_metadata" and "_some" nodes from the JSON. I'm using JSON.NET.

Answer 1

I just ended up deserializing to JObject and recursively looping through that to remove unwanted fields. Here's the function for those interested.

private void removeFields(JToken token, string[] fields) {     JContainer container = token as JContainer;     if (container == null) return;      List<JToken> removeList = new List<JToken>();     foreach (JToken el in container.Children())     {         JProperty p = el as JProperty;         if (p != null && fields.Contains(p.Name))         {             removeList.Add(el);         }         removeFields(el, fields);     }      foreach (JToken el in removeList)     {         el.Remove();     } } 

Answer 2

Building off of @[Mohamed Nuur]'s answer, I changed it to an extension method which I think works better:

 public static JToken RemoveFields(this JToken token, string[] fields)     {         JContainer container = token as JContainer;         if (container == null) return token;          List<JToken> removeList = new List<JToken>();         foreach (JToken el in container.Children())         {             JProperty p = el as JProperty;             if (p != null && fields.Contains(p.Name))             {                 removeList.Add(el);             }             el.RemoveFields(fields);         }          foreach (JToken el in removeList)         {             el.Remove();         }          return token;     } 

Here is unit test:

[TestMethod]      public void can_remove_json_field_removeFields()      {         string original = "{\"d\":{\"results\":[{\"__metadata\":{},\"remove\":\"done\",\"prop1\":\"value1\",\"prop2\":\"value2\",\"__some\":\"value\"},{\"__metadata\":{},\"prop3\":\"value1\",\"prop4\":\"value2\",\"__some\":\"value\"}],\"__metadata\":{\"prop3\":\"value1\",\"prop4\":\"value2\"}}}";         string expected = "{\"d\":{\"results\":[{\"prop1\":\"value1\",\"prop2\":\"value2\",\"__some\":\"value\"},{\"prop3\":\"value1\",\"prop4\":\"value2\",\"__some\":\"value\"}]}}";         string actual = JToken.Parse(original).RemoveFields(new string[]{"__metadata", "remove"}).ToString(Newtonsoft.Json.Formatting.None);         Assert.AreEqual(expected, actual);      }