I have been working in nodejs development since last year and gave server side swift a try just to learn the basics since server side provided significant performance advantage than nodejs according to an article I read on medium.
However lack of wide module and support similar to npm in nodejs might be an issue. Secondly there were certain swift frameworks like perfect,vapor and kitura written for the same purpose. Out of them perfect was little easy to set up.
I felt that might server side might enhance backend capabilities but there was not a wide support for its implementation so went back to nodejs since using same language(js) in backend and frontend does seem much easier.