 <p>Right click on the file choose "properties" and set "content" as for the "Build Action"<br> .JSON is not known to VS2010 web application file types You can change the behavior of vS2010 by <a href="http://blog.andreloker.de/post/2010/07/02/Visual-Studio-default-build-action-for-non-default-file-types.aspx" rel="nofollow">editing the registry</a> </p>