How Can I Output Pure JSON Responses from an ASMX Web Service?

Generating Pure JSON Responses from ASMX Web Services

ASMX web services, by default, return XML data. However, many applications require JSON output. While using ScriptMethod(ResponseFormat = ResponseFormat.Json) might seem like a solution, it actually wraps the JSON in an XML container.

To achieve pure JSON responses, avoid using the ResponseFormat property and instead directly write the JSON string to the HttpResponse object. This approach eliminates the XML wrapper and delivers clean JSON data. Modify your WebMethod to use a void return type and write the JSON string directly:

[System.Web.Script.Services.ScriptService]
public class WebServiceClass : System.Web.Services.WebService
{
    [WebMethod]
    public void WebMethodName()
    {
        HttpContext.Current.Response.ContentType = "application/json"; //Crucial for correct content type
        HttpContext.Current.Response.Write("{ \"property\": \"value\" }"); 
    }
}

Note the addition of HttpContext.Current.Response.ContentType = "application/json";. This line is crucial; it sets the correct content type header, ensuring the client correctly interprets the response as JSON. This method allows for the creation of pure JSON responses from ASMX without needing external libraries or tools.

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