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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 Pencil?

A web application microframework for Rust
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      What companies use ExpressJS?
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        What are some alternatives to ExpressJS, Flask, and Pencil?
        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 Pencil
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        Interest over time
        Reviews of ExpressJS, Flask, and Pencil
        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 Pencil
        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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