title: Swagger API Documentation in NodeJS
body: <p>I am facing the problem in setting up Swagger. How can I implement Swagger to in my node-express project to write API Doc for existing APIs?
  I have looked swagger, swagger-ui, and swagger-ui-dist npm packages. But not getting the desired output. 
  I want to use Swagger UI but getting counfused in the confugurations. Can anybody tell me the step by step guide for the configuration?
  Need help. </p>