http://blogs.msdn.com/b/hongyes/archive/2012/03/12/using-razor-template-engine-in-web-api-self-host-application.aspx[Update 8/15/2012] Update sample to Web API RTM packages As Web API is released with ASP.NET MVC 4 beta, it can be used in both web host and self host. You can view a sample code for self host here . When writing self host app, you may probably want toen-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)http://blogs.msdn.com/b/hongyes/archive/2012/03/12/using-razor-template-engine-in-web-api-self-host-application.aspx#10329119Thu, 12 Jul 2012 06:22:46 GMT91d46819-8472-40ad-a661-2c78acb4018c:10329119Beep<p>Hi can you please update the source to RC version of webapi.</p> <div style="clear:both;"></div><img src="http://blogs.msdn.com/aggbug.aspx?PostID=10329119" width="1" height="1">http://blogs.msdn.com/b/hongyes/archive/2012/03/12/using-razor-template-engine-in-web-api-self-host-application.aspx#10322146Wed, 20 Jun 2012 11:29:38 GMT91d46819-8472-40ad-a661-2c78acb4018c:10322146dfg<p>One downside with this approach is that it can now &#39;only&#39; support html. With an html media formatter the client can choose what format the data is returned in.</p> <div style="clear:both;"></div><img src="http://blogs.msdn.com/aggbug.aspx?PostID=10322146" width="1" height="1">