How to Convert ASMX Web Service XML Output to Pure JSON?

Convert ASMX file output to JSON

Question:

Despite using the ResponseFormat configuration, the output generated by the ASMX web service is still in XML instead of the required JSON format.

Code-behind:

<code class="language-csharp">[System.Web.Script.Services.ScriptService]
public class _default : System.Web.Services.WebService {
    [WebMethod]
    [ScriptMethod(UseHttpGet = true,ResponseFormat = ResponseFormat.Json)]
    public string[] UserDetails()
    {
        return new string[] { "abc", "def" };
    }
}</code>

Solution:

To output plain JSON without XML wrapping, modify the code as follows:

Code-behind:

<code class="language-csharp">[System.Web.Script.Services.ScriptService]
public class _default : System.Web.Services.WebService {
    [WebMethod]
    public void UserDetails()
    {
        HttpContext.Current.Response.Write("{property: value}");
    }
}</code>

Instructions:

Change the WebMethod's return type to void and use the Response.Write method to write the JSON string directly to the HttpResponse. This method provides a plain JSON response without XML wrapping.

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