What is ExpressJS?

Express is a minimal and flexible node.js web application framework, providing a robust set of features for building single and multi-page, and hybrid web applications.

What is hapi?

hapi is a simple to use configuration-centric framework with built-in support for input validation, caching, authentication, and other essential facilities for building web applications and services.

What is Sails.js?

Sails is designed to mimic the MVC pattern of frameworks like Ruby on Rails, but with support for the requirements of modern apps: data-driven APIs with scalable, service-oriented architecture.

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What are some alternatives to ExpressJS, hapi, and Sails.js?
Koa aims to be a smaller, more expressive, and more robust foundation for web applications and APIs. Through leveraging generators Koa allows you to ditch callbacks and greatly increase error-handling. Koa does not bundle any middleware.
Lots of people use React as the V in MVC. Since React makes no assumptions about the rest of your technology stack, it's easy to try it out on a small feature in an existing project.
Flask is intended for getting started very quickly and was developed with best intentions in mind.
Django is a high-level Python Web framework that encourages rapid development and clean, pragmatic design.
Go is expressive, concise, clean, and efficient. Its concurrency mechanisms make it easy to write programs that get the most out of multicore and networked machines, while its novel type system enables flexible and modular program construction. Go compiles quickly to machine code yet has the convenience of garbage collection and the power of run-time reflection. It's a fast, statically typed, compiled language that feels like a dynamically typed, interpreted language.
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How developers use ExpressJS, hapi, and Sails.js
Avatar of Cloudcraft
Cloudcraft uses ExpressJSExpressJS

Express.js is the workhorse of the backend. It's not the most exciting part of a stack, but it works, is very well documented, and you can find a plugin for almost everything you could possibly want. We also carefully evaluated Koa.js, but decided not to go down this route: fewer plugins, less documentation & answers online. I'm also not personally convinced by the generators yield syntax at all. ES7 async functions looks like a much better bet, and with Promises and Babel I can have that already today.

Avatar of Volkan Özçelik
Volkan Özçelik uses ExpressJSExpressJS

I use express.js for and web apps.

Express is well-known, lightweight, works out-of-the-box, has great middleware support and has minimal learning curve.

It is the best framework to start developing a general Node.js web app.

Avatar of Kent Steiner
Kent Steiner uses ExpressJSExpressJS

I'm fluent in ExpressJS, but over the past two years I have moved to HapiJS. Similar results, but I find Hapi to be more full-featured towards my app, api and service needs. I can operate confidently in both.

Avatar of Promethean TV
Promethean TV uses ExpressJSExpressJS

PrometheanTV utilizes the ExpressJS web application framework to deploy various web applications and services including the Broadcast Center Tool, our video embed service, and our REST API.

Avatar of Merge In
Merge In uses ExpressJSExpressJS

We rely on ExpressJS to serve our content simply, easily, and effectively, without the bloat-ware. Big thanks to StrongLoop for supporting this package.

Avatar of Thibault Maekelbergh
Thibault Maekelbergh uses hapihapi

Serves static content. Was added to make it more easy to transition to serverside view templating and API.

Avatar of Ian Kelly
Ian Kelly uses hapihapi

Web framework for building RESTful APIs in Javascript.

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Cotalented uses Sails.jsSails.js

Sails serves the API backend

Avatar of Dave Woolfenden
Dave Woolfenden uses hapihapi

REST libraries usage

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