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

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?

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?

>>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.
http://www.ipreferjim.com/2014/09/data-at-the-root-level-is-invalid-line-1-position-1/

you can also get some explanation from this article:

Data at the root level is invalid
http://madskristensen.net/post/data-at-the-root-level-is-invalid

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.

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 <FromBody> method but my code doesn't recognize teh keyword for some reason

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)

Imports System.Web.Services
Imports System.Web.Http

<System.Web.Script.Services.ScriptService()>
<WebService(Namespace:="http://XXXXXXXXX.com/")>
<WebServiceBinding(ConformsTo:=WsiProfiles.BasicProfile1_1)> _
<Global.Microsoft.VisualBasic.CompilerServices.DesignerGenerated()> _

Public Class HubSpot
    Inherits System.Web.Services.WebService

    <HttpPost()>
    Public Function ConvertMarketingQualifiedToLead(<FromBody> ByVal pJSON As String) As Integer

        Return 200

    End Function

End Class

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Can't get much simpler than that :(

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

{
  "status": "error",
  "message": "contact does not exist",
  "correlationId": "7d60e72c-98f4-4ca4-916e-89a792d7266e",
  "requestId": "30770fba-1ded-4d9f-8d2e-0277564729e1"
}

And here is the result:
<?xml version="1.0" encoding="utf-8"?><soap:Envelope xmlns:soap="http://www.w3.org/2003/05/soap-envelope" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"><soap:Body><soap:Fault><soap:Code><soap:Value>soap:Receiver</soap:Value></soap:Code><soap:Reason><soap:Text xml:lang="en">System.Web.Services.Protocols.SoapException: Server was unable to process request. ---> System.Xml.XmlException: Data at the root level is invalid. Line 1, position 1.
   at System.Xml.XmlTextReaderImpl.Throw(Exception e)
   at System.Xml.XmlTextReaderImpl.Throw(String res, String arg)
   at System.Xml.XmlTextReaderImpl.ParseRootLevelWhitespace()
   at System.Xml.XmlTextReaderImpl.ParseDocumentContent()
   at System.Xml.XmlTextReaderImpl.Read()
   at System.Xml.XmlTextReader.Read()
   at System.Web.Services.Protocols.SoapServerProtocol.SoapEnvelopeReader.Read()
   at System.Xml.XmlReader.MoveToContent()
   at System.Web.Services.Protocols.SoapServerProtocol.SoapEnvelopeReader.MoveToContent()
   at System.Web.Services.Protocols.SoapServerProtocolHelper.GetRequestElement()
   at System.Web.Services.Protocols.Soap12ServerProtocolHelper.RouteRequest()
   at System.Web.Services.Protocols.SoapServerProtocol.RouteRequest(SoapServerMessage message)
   at System.Web.Services.Protocols.SoapServerProtocol.Initialize()
   at System.Web.Services.Protocols.ServerProtocolFactory.Create(Type type, HttpContext context, HttpRequest request, HttpResponse response, Boolean& abortProcessing)
   --- End of inner exception stack trace ---</soap:Text></soap:Reason><soap:Detail /></soap:Fault></soap:Body></soap:Envelope>

Thanks for trying Ryan,

I have rebuilt the app using WebAPI & controllers etc. and everything is now working perfectly