Json Serialization C#

I have having problems serializing the JSON coming back from the API. I am trying to just convert to a C# object that I can use in a response.
Something like api_detail_url is valid JSON but when I try to read the content of the response and convert it, the ApiDetailUrl is coming across as null. I am curious if anybody else has had this problem. I tried to add the [JsonProperty(PropertyName = "api_details_url")] annotation above the property but that did not solve the issue. Is there a specific library/NuGet that works best in C#?