How to Get Pure JSON Output from an ASMX Web Service?

Generating Pure JSON from ASMX Web Services

ASMX web services traditionally return XML data. To achieve pure JSON output and avoid XML wrapping, follow these steps:

Configuring JSON Response

Even with the ResponseFormat.Json setting in the ScriptMethod attribute, XML wrapping can persist. To resolve this:

1. Adjust WebMethod Return Type: Alter your WebMethod's return type to void. This prevents automatic XML serialization of the return value.
2. Direct JSON Output: Employ HttpContext.Current.Response.Write to send the JSON string directly to the HttpResponse. This provides complete control over the JSON structure, eliminating unwanted XML formatting.

Illustrative Code:

[System.Web.Script.Services.ScriptService]
public class WebServiceClass : System.Web.Services.WebService {
    [WebMethod]
    public void WebMethodName()
    {
        HttpContext.Current.Response.Write("{ \"property\": \"value\" }");
    }
}

This modification ensures your ASMX service delivers pure JSON, facilitating seamless integration with JSON-dependent applications. Note the corrected JSON formatting in the example.

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