When comparing Beego vs Koa, the Slant community recommends Beego for most people. In the question“What are the best backend web frameworks?” Beego is ranked 18th while Koa is ranked 33rd. The most important reason people chose Beego is:
Beego is a "batteries included" web framework, which means that a lot of features already come out of the box. This way you don't have to spend time and find third-party libraries to integrate to the framework for most of the tasks you need to complete.
Specs
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Pros
Pro No need to find and install external libraries
Beego is a "batteries included" web framework, which means that a lot of features already come out of the box. This way you don't have to spend time and find third-party libraries to integrate to the framework for most of the tasks you need to complete.
Pro Built-in tool which watches for changes
Beego has a built-in tool which watches the code for changes. This tool (called bee tool) can be configured to run any task once the code changes. It can run tests or reload and rebuild the whole project.
Pro Built in ORM
Beego's eloquent ORM is a simple and fast Object-Relational Mapping which helps with organizing the application's database. Beego examples and documentation all use the beego ORM. No need to learn to use and integrate another ORMs API.
Pro Captcha
Pro Auto testing
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 Very opinionated
Con Very opinionated
Con Non-idiomatic code
Con Builds may fail silently
Sometimes even though a build has failed, the pages will still render. Apparently it caches a previous build when the current one has a problem. This can be a frustrating though because it leaves you wondering why the page you are working on stopped working out of the blue.
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.