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at your web service, did it provide a sample on how the request parameters should look like? 
 
also, what's your 3rd party app? is it in .net, java, php, etc?
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The 3rd party app is HubSpot (hubspot.com) I have no control over what/how they send the data but I'm certain their POST is correct, it's something my end. 
 
It's just a string parameter, however I'm not sure I should be using a parameter as the data is sent in the RAW BODY?
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<div>
&gt;&gt;Data at the root level is invalid. Line 1, position 1 
I'm actually facing similar issue recently but I was managed to fix the issue by applying similar fixes in this link: 
 
Data at the root level is invalid. Line 1, position 1. 
<a href="http://www.ipreferjim.com/2014/09/data-at-the-root-level-is-invalid-line-1-position-1/" rel="ugc">http://www.ipreferjim.com/2014/09/data-at-the-root-level-is-invalid-line-1-position-1/</a> 
 
you can also get some explanation from this article: 
 
Data at the root level is invalid 
<a href="http://madskristensen.net/post/data-at-the-root-level-is-invalid" rel="ugc">http://madskristensen.net/post/data-at-the-root-level-is-invalid</a> 
 
both required fixes in coding. 
 
for your case, perhaps you could advise the support from HubSpot (hubspot.com) and see if they can provide you some solutions to solve your issue. 
 
I'm thinking the issue relying on the approach we send the request to your web service.
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I think what I need to do here is get the RAW BODY from the request and not a parameter, I've seen several posts using the &lt;FromBody&gt; method but my code doesn't recognize teh keyword for some reason
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I've looked at both of those and they don't really answer my question as they are both talking about XML documents and my issue is with a JSON format string. 
 
my web service is just about as simple as it gets, it does no processing and simply return a 200. 
 
But when I POST the JSON string to it I get the Data at the root level is invalid error 
 
This is the web method (HttpPost) 
 
 

<pre><code class="code-10 nolinks" id="code-20-41800404-1">Imports System.Web.Services
Imports System.Web.Http

&lt;System.Web.Script.Services.ScriptService()&gt;
&lt;WebService(Namespace:=&quot;http://XXXXXXXXX.com/&quot;)&gt;
&lt;WebServiceBinding(ConformsTo:=WsiProfiles.BasicProfile1_1)&gt; _
&lt;Global.Microsoft.VisualBasic.CompilerServices.DesignerGenerated()&gt; _

Public Class HubSpot
 Inherits System.Web.Services.WebService

 &lt;HttpPost()&gt;
 Public Function ConvertMarketingQualifiedToLead(&lt;FromBody&gt; ByVal pJSON As String) As Integer

 Return 200

 End Function

End Class
</code></pre>
 
Can't get much simpler than that :(
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SnapShot.png

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Ryan, 
 
I tested using postman and still got a 500 error :( 
 
Here's what I used: unfortunately I can'd display the host info :) 
 
POST /HubSpot.asmx HTTP/1.1 
Host: xxxxxxx.com 
Content-Type: application/json 
Cache-Control: no-cache 
Postman-Token: 190b3c0e-7603-cb90-d567-961cb0b98fb9 
 
{ 
&nbsp; &quot;status&quot;: &quot;error&quot;, 
&nbsp; &quot;message&quot;: &quot;contact does not exist&quot;, 
&nbsp; &quot;correlationId&quot;: &quot;7d60e72c-98f4-4ca4-916e-89a792d7266e&quot;, 
&nbsp; &quot;requestId&quot;: &quot;30770fba-1ded-4d9f-8d2e-0277564729e1&quot; 
} 
 
And here is the result: 
&lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;&lt;soap:Envelope xmlns:soap=&quot;<a href="http://www.w3.org/2003/05/soap-envelope" rel="ugc">http://www.w3.org/2003/05/soap-envelope</a>&quot; xmlns:xsi=&quot;<a href="http://www.w3.org/2001/XMLSchema-instance" rel="ugc">http://www.w3.org/2001/XMLSchema-instance</a>&quot; xmlns:xsd=&quot;<a href="http://www.w3.org/2001/XMLSchema" rel="ugc">http://www.w3.org/2001/XMLSchema</a>&quot;&gt;&lt;soap:Body&gt;&lt;soap:Fault&gt;&lt;soap:Code&gt;&lt;soap:Value&gt;soap:Receiver&lt;/soap:Value&gt;&lt;/soap:Code&gt;&lt;soap:Reason&gt;&lt;soap:Text xml:lang=&quot;en&quot;&gt;System.Web.Services.Protocols.SoapException: Server was unable to process request. ---&gt; System.Xml.XmlException: Data at the root level is invalid. Line 1, position 1. 
&nbsp; &nbsp;at System.Xml.XmlTextReaderImpl.Throw(Exception e) 
&nbsp; &nbsp;at System.Xml.XmlTextReaderImpl.Throw(String res, String arg) 
&nbsp; &nbsp;at System.Xml.XmlTextReaderImpl.ParseRootLevelWhitespace() 
&nbsp; &nbsp;at System.Xml.XmlTextReaderImpl.ParseDocumentContent() 
&nbsp; &nbsp;at System.Xml.XmlTextReaderImpl.Read() 
&nbsp; &nbsp;at System.Xml.XmlTextReader.Read() 
&nbsp; &nbsp;at System.Web.Services.Protocols.SoapServerProtocol.SoapEnvelopeReader.Read() 
&nbsp; &nbsp;at System.Xml.XmlReader.MoveToContent() 
&nbsp; &nbsp;at System.Web.Services.Protocols.SoapServerProtocol.SoapEnvelopeReader.MoveToContent() 
&nbsp; &nbsp;at System.Web.Services.Protocols.SoapServerProtocolHelper.GetRequestElement() 
&nbsp; &nbsp;at System.Web.Services.Protocols.Soap12ServerProtocolHelper.RouteRequest() 
&nbsp; &nbsp;at System.Web.Services.Protocols.SoapServerProtocol.RouteRequest(SoapServerMessage message) 
&nbsp; &nbsp;at System.Web.Services.Protocols.SoapServerProtocol.Initialize() 
&nbsp; &nbsp;at System.Web.Services.Protocols.ServerProtocolFactory.Create(Type type, HttpContext context, HttpRequest request, HttpResponse response, Boolean&amp; abortProcessing) 
&nbsp; &nbsp;--- End of inner exception stack trace ---&lt;/soap:Text&gt;&lt;/soap:Reason&gt;&lt;soap:Detail /&gt;&lt;/soap:Fault&gt;&lt;/soap:Body&gt;&lt;/soap:Envelope&gt;
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<div>
Thanks for trying Ryan, 
 
I have rebuilt the app using WebAPI &amp;&nbsp;controllers etc. and everything is now working perfectly
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<div class="content wysiwyg-content">
I hope I can explain this fully :) 
 
I have a web service URL that accepts a JSON string from a 3rd party application but it is failing with the above error. 
 
Two things to note: 
1. if I configure the 3rd party app to send to a public testing URL (<a href="http://requestb.in" rel="ugc">http://requestb.in</a>) it seems to work just fine 
2. If I copy the raw body and test it directly on my server, it also works perfectly and return a 200 response 
 
However, when I configure the 3rd party app to send to my URL my service returns 500 response. I have added the application/json mime type to IIS. 
 
I'm sure the issue is on my end but I'm at a loss as to how to troubleshoot this further 
 
The attached image shows the test screen and the resulting 200 response 
<a href="https://filedb.experts-exchange.com/incoming/2016/09_w38/1116817/testing.png" target="_blank" title="testing.png (20 KB)"><img alt="testing.png" class="file-block lazyload" style="max-width: 527px;" data-src="https://filedb.experts-exchange.com/incoming/2016/09_w38/1116817/testing.png" /></a> 
Any help would be greatly appreciated
</div>
</div>

testing.png

I hope I can explain this fully :)

I have a web service URL that accepts a JSON string from a 3rd party application but it is failing with the above error.

Two things to note:
1. if I configure the 3rd party app to send to a public testing URL (http://requestb.in) it seems to work just fine
2. If I copy the raw body and test it directly on my server, it also works perfectly and return a 200 response

However, when I configure the 3rd party app to send to my URL my service returns 500 response. I have added the application/json mime type to IIS.

I'm sure the issue is on my end but I'm at a loss as to how to troubleshoot this further

The attached image shows the test screen and the resulting 200 response


Any help would be greatly appreciated

Data at the root level is invalid. Line 1, position 1

Extensible Markup Language (XML) refers to the encoding of documents such that they can be read by both machines and humans. XML documents use tags to show the beginning and end of a set of data. XML is used extensively on websites to show volumes of data, and is the default for a number of office productivity suites. This topic includes discussions of XML-related technologies, such as XQuery (the XML Query language), XPath (the XML Path language), XSLT (eXtensible Stylesheet Language Transformations), XLink (the XML Linking language) and XPointer (the XML Pointer language).

IIS is Internet Information Services, the web server included with Windows Server operating systems. All current versions are built on a modular architecture; modules can be added or removed individually so that those required for specific functionality are installed. The full installation of IIS includes HTTP, security, content, compression, caching, logging and diagnostics.

Microsoft IIS Web Server

JavaScript Object Notation, or JSON, is human-readable text used when transmitting data objects consisting of attribute:value pairs between a server and a web application as an alternative to XML. JSON, while it is originally derived from JavaScript, is a language-independent data format. Code for parsing and generating JSON data is available in many programming languages.