When comparing Kweb vs Koa, the Slant community recommends Koa for most people. In the question“What are the best backend web frameworks?” Koa is ranked 33rd while Kweb is ranked 46th. The most important reason people chose Koa is:
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.
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Pros
Pro No need to deal with complex JavaScript toolchain
With Kweb you work in Kotlin from the server, using your favorite Kotlin/Java tools. Kweb integrates and supports popular JavaScript frameworks like Semantic UI. No need to worry about WebPack, cross-compilation, ES6/ES7/React/Angular etc.
Pro Automatic server-side rendering to accelerate initial page render
Pro Handles state end-to-end, bind the DOM directly to DB state and it will stay in sync automatically
Pro Written in Kotlin, a modern, powerful, and fast-growing programming language
Pro Automates communication between browser and server
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 Not yet 1.0.0, still in beta and under active development
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.