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    <p>From your examples and comments, it's possible your JSON isn't valid. You can validate your output at <a href="http://jsonlint.com/" rel="nofollow">JSONLint</a>. It'd really help if you showed how you were creating your JSON feed at <code>cssAttempt3.aspx/ConvertDataTabletoString</code>.</p> <p>Another problem is that you are using <code>JSON.parse</code> instead of <code>JSON.stringify</code>. </p> <p><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/parse?redirectlocale=en-US&amp;redirectslug=JavaScript%2FReference%2FGlobal_Objects%2FJSON%2Fparse" rel="nofollow">JSON.parse</a> parses a <em>string</em> as JSON.</p> <p>The opposite, <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/stringify" rel="nofollow">JSON.stringify</a> accepts a value to convert to a JSON string. Your value (<code>response</code>) is already JSON.</p> <pre><code>function foo() { $.ajax({ type: 'POST', url: 'cssAttempt3.aspx/ConvertDataTabletoString', dataType: 'json', contentType: "application/json; charset=utf-8", success: function (response) { var t = JSON.stringify(response); var o = JSON.parse(t); //now this should work. Turns it back into what you get from url response. console.log(t); }, failure: function () { console.log("Fail"); }, error: function (jqXHR,textStatus,errorThrown) { console.log(errorThrown); //...its possibly not even JSON response at all! } }); } </code></pre> <p>As a side not, a more efficient way to create your JSON is is with an ASHX handler... and will only take minor modifications to your code:</p> <p>Add <code>[DataContract]</code> and <code>[DataMember]</code> to your class (you need a reference to <code>System.Runtime.Serialization</code> for this to work):</p> <pre><code>[DataContract] public class MyDataTableClass { [DataMember] private string pro; [DataMember] private string sn; [DataMember] private string po; //etc </code></pre> <p>And then make the ASHX (Right-click your project -> Add New Item -> Generic Handler):</p> <pre><code>public class ConvertDataTabletoString: IHttpHandler { public void ProcessRequest(HttpContext context) { List&lt;MyDataTableClass&gt; m = //populate MemoryStream stream = new MemoryStream(); DataContractJsonSerializer s = new DataContractJsonSerializer(typeof(List&lt;MyDataTableClass&gt;)); s.WriteObject(stream, m); stream.Position = 0; StreamReader sr = new StreamReader(stream); context.Response.ContentType = "application/json"; context.Response.Write(sr.ReadToEnd()); } public bool IsReusable { get { return false; } } } </code></pre> <p>then just update your url: <code>url: 'ConvertDataTabletoString.ashx',</code></p>
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    1. COI'm new to the concept of ashx. I've added namespace MyTypes {[DataContract//etc to my cs file and added the ashx file, but lots of errors come up with "The type or namespace could not be found..."
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    2. COI verified my JSON at JSONLint. Aside from the surrounding apostrophes (I tried to exclude them; same results), it's valid.
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    3. COYou need `using System.Runtime.Serialization`
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