Utilizing AJAX to Transfer JSON Data to WCF

I've been searching tirelessly online trying to figure out how to properly send a JSON string to a WCF service. I have multiple successful GET requests in my application, but I just can't seem to get the POST request to work - I keep getting a 400 error in the Chrome browser.

Here is an example of my code:

JS:

 workDataAsJson = JSON.stringify('{"TestData":"121"}');
    $.ajax({      
      type: "POST",
      async: true,
      cache: false,
      timeout: webCallDefaultTimeout,
      contentType: "application/json; charset=utf-8",
      url: baseUrl.concat('UpsertWorkData/' + workDataAsJson),                      
      dataType: "json",
      success: function (response, status, jqXHR) {     
        if (status == 'success') {
            var workplanData = $.parseJSON(response);                 
            // notify user of success,...

        } else {
          displayGenericModal('Web Service Error', 'Uh Oh! Unable to Connect to the Database to Obtain Work Data');
        }
      },
      error: function (response, status, jqXHR) {
          displayGenericModal('Web Service Error', 'Uh Oh! Unable to Connect to the Database to Obtain Work Data');          
      }        
  });    
  } catch(ex) {
    alert(ex);
  }

Now for the WCF operation contract,...

    [OperationContract]
    [WebInvoke(BodyStyle = WebMessageBodyStyle.Wrapped, Method = "POST", UriTemplate = "UpsertWorkData/{WorkData}", RequestFormat = WebMessageFormat.Json, ResponseFormat = WebMessageFormat.Json)]
    string UpsertWorkData(string WorkData);

Trying to configure the web.config file has also been a journey. Here are some snippets:

<?xml version="1.0"?>
<configuration>
  <system.web.extensions>
    <scripting>
      <webServices>
        <jsonSerialization maxJsonLength="2147483644"/>
      </webServices>
    </scripting>
  </system.web.extensions>
  <appSettings>
    <add key="aspnet:UseTaskFriendlySynchronizationContext" value="true"/>
  </appSettings>
  
  (Additional configuration settings here)
  
  </configuration>

If anyone can offer guidance or solutions, it would be greatly appreciated. Thank you!

Answer №1

The issue lies in attempting to convert data that is already in string format into a JSON string. Omit the JSON.stringify function.

workDataAsJson =  '{"TestData":"121"}';

Alternatively, you can use:

workDataAsJson = JSON.stringify({"TestData":"121"});

Additionally, ensure to modify the URI as follows:

  [OperationContract]    
  [WebInvoke(Method = "POST",
  UriTemplate = "/UpsertWorkData",
  RequestFormat = WebMessageFormat.Json,
  ResponseFormat = WebMessageFormat.Json,
  BodyStyle = WebMessageBodyStyle.Bare)]     
  string UpsertWorkData(string WorkData);

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