Thanks Viv. You pointed me in the correct direction and I have it working now.

>>Hi all
>>
>>Probably a newbe question but I can't get this to work. I am trying to consume an API return nested json. I have tried the following code and get this error.
>>
>>Newtonsoft.Json.JsonSerializationException: Cannot deserialize the current JSON object (e.g. {"name":"value"}) into type 'System.Collections.Generic.List`1[m2m.Model.DetailsHeader]' because the type requires a JSON array (e.g. [1,2,3]) to deserialize correctly.
>>
>>

>>            HttpClient client = new HttpClient();
>>            client.BaseAddress = new Uri(url);
>>            var response = await client.GetAsync(client.BaseAddress);
>>            response.EnsureSuccessStatusCode();
>>            var JsonResult = response.Content.ReadAsStringAsync().Result; // I have confirmed that the raw json is in JsonResult.
>>            
>>            var promotemp = JsonConvert.DeserializeObject<List<DetailsHeader>>(JsonResult);
>>
>>namespace m2m.Model
>>{
>>    }
>>
>>    public class DetailsHeader
>>    {
>>        public int autocouponlinkpk { get; set; }
>>        public DateTime enddate { get; set; }
>>        public string market_descrp { get; set; }
>>        public string globallogo { get; set; }
>>        public List<PromoDetails> details { get; set; }
>>    }
>>
>>    public class PromoDetails
>>    {
>>        public long autocouplinkpage2pk { get; set; }
>>        public string image_fullurl { get; set; }
>>        public string group_descrp { get; set; }
>>    }
>>}
>>
>>

>>
>>and here is the json
>>
>>

>>{
>>  "autocouponlinkpk": 170,
>>  "enddate": "2016-06-30",
>>  "market_descrp": "My test",
>>  "globallogo": "http://subscriberimages/47/fkpzlkxift-1423092258.jpg",
>>  "details": [
>>    {
>>      "autocouplinkpage2pk": 82,
>>      "image_fullurl": "http://marketImgs/47/xhkppjcxey-1445635420.png",
>>      "group_descrp": "This is page 2"
>>    },
>>    {
>>      "autocouplinkpage2pk": 83,
>>      "image_fullurl": "http://marketImgs/47/movjznnosp-1445700931.jpg",
>>      "group_descrp": "page 2 of page 2."
>>    },
>>    {
>>      "autocouplinkpage2pk": 84,
>>      "image_fullurl": "http://marketImgs/47/vbzkznsbkg-1445700969.jpg",
>>      "group_descrp": "page 3 of page 2"
>>    }
>>  ]
>>}
>>

>>
>>What am I doing wrong?
>>
>>Thanks.
>
>As per the error : the Json is not an array so can't be converted to a list. Use:

var promotemp = JsonConvert.DeserializeObject<DetailsHeader>(JsonResult);