Sending multiple param as a post data

[sumitshrm4]

@johnculviner @jeff-h @niki4810 I need to pass two param in data both are string. I am doing it in this way. My params name in service are url and Filter.

data : {url: '<%=XXX.Config.AppSettings.Settings["RESTServiceURL"].Value%>/DownloadSomething', Filter: JSON.stringify(data1), ExtensionData:'""'}

But this is not working, how can i achieve this ?