Which Node.js Framework should I use?

1. Express.js
What projects is it for?
Express is a great framework for small-scale projects. Developing large projects using Express.js won’t be such a good idea. Among the famous websites created with this framework are Storify, MySpace, and LearnBoost.
What benefits does it bring?
Express gives a broad scope of capacities for developing SPA, MPA and a mix of these two. The majority of Express programmers consider it as a well-thought-out and high-powered tool. Among the other benefits of this framework are routing and middleware that makes the testing stage simpler as well as boost app performance.
The high-powered Express API allows programmers to carry out various operations. It may be from developing a REST API server to creating routes for an elementary web app and then improving it by utilizing query string and route parameters.
The API also benefited from Node.js package manager that provides numerous external plug-ins. E.g., you are able to equip your app with login via social networks in no time with the help of OAuth authorization middleware.
On the other side, Express doesn’t offer a single way of app structure that is able to bring big troubles for every developer. It’s because this can result in the non-maintainability of apps. Besides, another concern is a lot of unautomated laborious tasks that Express.js requires. They are able to influence memory load if they aren’t managed in a professional way.

2. Koa.js
What projects is it for?
Koa is less weighty and its modules are more customizable than Express. Choose Koa if you want to fully control what to add in your app. A new app you create with Koa.js doesn’t contain a lot of predefined material that cannot be removed.
What benefits does it bring?
Koa.js was built by the same team as Express.js. Koa claims to be a next-gen tool that allows to write less code and provide more result as compared with the Express.
Koa is concentrated on building APIs as well as web software that provides better performance. While the Express framework is constantly using callback functions at its basis, Koa utilizes the generator functions from ECMAScript 6. Callbacks often represent long chains of interconnected functions with poor structure and complex to understand the logic. Generators offer a great way to improve code visibility, edit it simpler as well as cope with errors better.

3. Sails.js
What projects is it for?
Corporate-class software with large data processing is what it’s best at. In particular, Sails.js can be used to build multi-user games, chat apps, etc. The insufficiency of clear documentation for this framework may cause problems. However, the programmers that are already familiar with the Rails or Express framework won’t experience any problems with Sails.
What benefits does it bring?
- The framework uses automated generators, hence it occupies a greater priority in the call stack similar to Express;
- There are a lot of database adapters provided by the Sails framework community. Database adapters allow using the only data structure irrespective of the database management system used. E.g., there are adapters for various database management systems like MySQL and many others.
- A Waterline ORM layer enables to use of one query language irrespective of the database. Thus, Waterline is suitable for whichever database you need and moreover for using web services.

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