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I created a Web API which accepts Json string and returns an XML. I am trying to test my web API using fiddler and unable to test it.

My get method in code: 

[HttpGet]        
        public XmlDocument GetXML([FromBody]string JsonString)
        { 
            System.Xml.XmlDocument xmlDocument = Newtonsoft.Json.JsonConvert.DeserializeXmlNode(JsonString);

In fiddler :When I provide the content type as application json(below is screen shot). It throws a HTTP 500 error. "An error has occurred.No MediaTypeFormatter is available to read an object of type 'String' from content with media type 'application/json'."

But when I provide the content-Type :application/xml. It successfully makes a connection to the web api but the Input parameter "JsonString" is null. enter image description here

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DaD
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1 Answers1

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From your screenshot though it looks like you ARE in fact passing a string because it start with an equals and quotes like ="{ ... }". This looks like a JSONP body. JSON would look start with curl braces like { ... }

If you need to accept JSONP have a look at this answer: JSONP with ASP.NET Web API

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Oliver
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  • Oliver, I am trying to send a Json String. The client application who will be using my API will be passing the Json data in a String. – DaD Aug 27 '15 at 20:43