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When comparing Dropwizard vs Koa, the Slant community recommends Dropwizard for most people. In the question“What are the best backend web frameworks?” Dropwizard is ranked 28th while Koa is ranked 33rd. The most important reason people chose Dropwizard is:
The application can be run and debugged from the IDE without the need to recompile or redeploy the WAR file. This is because a Dropwizard web application creates on main program which starts the jetty container.
Question Ranking
Pros
Pro Enhanced productivity and less timewasting
The application can be run and debugged from the IDE without the need to recompile or redeploy the WAR file. This is because a Dropwizard web application creates on main program which starts the jetty container.
Pro Application metrics integrated into the framework
Dropwizard comes with application metrics integrated out of the box. These metrics provide a lot of useful information such as request/response time.
For example, to get the execution time of a method, the @Timed annotation is used.
Pro Quick project bootstrap
Starting a project with Dropwizard si very easy and bootstraping is quick and painless. All that's needed is a single dependency added in the pom.xml file and it's ready to go.
Pro Generator support from ground up
Using generators (a bleeding edge feature, even for Node.js) would clean up your code from the mess caused by all those callbacks; making your code more manageable.
Pro Extremely lightweight
Koa is very lightweight with just 550 lines of code.
Pro async/await keywords are supported and has transcended beyond generator functions
Generators functions are of course a huge plus, but at the time Koa team has transcended generations functions and shifted towards async/await style programming. It has made the Koa best framework available in the market.
Pro Development team has a proven track record
Koa is developed by the team behind a widely used node.js framework (express.js).
Pro Built for ES6
Cons
Con Does not allow a lot a freedom of choice
Dropwizard removes a lot of freedom that the developer may have with other frameworks because of the fact that it tries to do everything itself. It chooses the best Java libraries for the job required, without allowing the developer much choice.
Con Community is relatively small
Con Not compatible with express style middleware
Koa uses generators which are not compatible with any other type of Node.js framework middleware.
Con Has no routes separated by HTTP method or URL pattern
Con Wrong Middle ware, security issue
