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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 Flask?

Flask is intended for getting started very quickly and was developed with best intentions in mind.

What is Rails API?

Rails::API is a subset of a normal Rails application, created for applications that don't require all functionality that a complete Rails application provides. It is a bit more lightweight, and consequently a bit faster than a normal Rails application. The main example for its usage is in API applications only, where you usually don't need the entire Rails middleware stack nor template generation.
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    What are some alternatives to ExpressJS, Flask, and Rails API?
    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.
    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.
    nginx [engine x] is an HTTP and reverse proxy server, as well as a mail proxy server, written by Igor Sysoev. According to Netcraft nginx served or proxied 30.46% of the top million busiest sites in Jan 2018.
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    Decisions about ExpressJS, Flask, and Rails API
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    Interest over time
    Reviews of ExpressJS, Flask, and Rails API
    Avatar of mjhea0
    Software Engineer at TestDriven Labs
    Review ofFlaskFlask

    Flask is a light, yet powerful Python web framework perfect for quickly building smaller web applications. It's a "micro-framework" that's easy to learn and simple to use, so it's perfect for those new to web development as well as those looking to rapidly develop a web application.

    How developers use ExpressJS, Flask, and Rails API
    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 Jack Littleton
    Jack Littleton uses FlaskFlask

    I use Flask for times when I need to create a REST API that interfaces with other Python code, or there is no specific reason why I'd want to use Node.JS. I prefer Flask because of its small learning curve, allowing me to get started coding as quickly as possible

    Avatar of Cloudify
    Cloudify uses FlaskFlask

    This lightweight web framework enables quick REST API development while enabling easy clustering, and the usage of multiple worker processes required to scale the REST API service to meet high volume requirements.

    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 Sail Tactics
    Sail Tactics uses FlaskFlask

    Service to query NOAA weather forecasts data and service to build tidal current forecast maps using AWS EC2 and Geoserver

    Avatar of OnlineCity
    OnlineCity uses FlaskFlask

    Flask drives our APIs, both the Website APIs and the majority of the REST Messaging APIs

    Avatar of papaver
    papaver uses FlaskFlask

    used flask for a few personal projects. enjoyed its simplicity and ease of use.

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