What is Express js

Question

I am a learner in Node js   What s Express js  What s the purpose of it with Node js  Why do we actually need Express js  How is it useful for us to use with Node js  What s Redis  Does it come with Express js

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Express js created by TJ Holowaychuk and now managed by the community  It is one of the most popular frameworks in the node js  Express can also be used to develop various products such as web applications or RESTful API For more information please read on the expressjs com official site

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Express js is a modular web framework for Node js It is used for easier creation of web applications and services Express js simplifies development and makes it easier to write secure  modular and fast applications  You can do all that in plain old Node js  but some bugs can  and will  surface  including security concerns  eg  not escaping a string properly  Redis is an in-memory database system known for its fast performance  No  but you can use it with Express js using a redis client   I couldn t be more concise than this  For all your other needs and information  Google is your friend

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This is over simplifying it  but Express js is to Node js what Ruby on Rails or Sinatra is to Ruby   Express 3 x is a light-weight web application framework to help organize your web application into an MVC architecture on the server side  You can use a variety of choices for your templating language  like EJS  Jade  and Dust js    You can then use a database like MongoDB with Mongoose  for modeling  to provide a backend for your Node js application  Express js basically helps you manage everything  from routes  to handling requests and views   Redis is a key value store -- commonly used for sessions and caching in Node js applications  You can do a lot more with it  but that s what I m using it for  I use MongoDB for more complex relationships  like line-item  lt -  order  lt -  user relationships  There are modules  most notably connect-redis  that will work with Express js  You will need to install the Redis database on your server   Here is a link to the Express 3 x guide  https   expressjs com en 3x api html

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Express js is a framework used for Node and it is most commonly used as a web application for node js   Here is a link to a video on how to quickly set up a node app with express https   www youtube com watch v QEcuSSnqvck

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What is Express js    Express js is a Node js web application server framework  designed for building single-page  multi-page  and hybrid web applications  It is the de facto standard server framework for node js   Frameworks built on Express  Several popular Node js frameworks are built on Express   LoopBack  Highly-extensible  open-source Node js framework for quickly creating dynamic end-to-end REST APIs  Sails  MVC framework for Node js for building practical  production-ready apps  Kraken  Secure and scalable layer that extends Express by providing structure and convention  MEAN  Opinionated fullstack JavaScript framework that simplifies and accelerates web application development    What is the purpose of it with Node js  Why do we actually need Express js  How it is useful for us to use with Node js   Express adds dead simple routing and support for Connect middleware  allowing many extensions and useful features  For example   Want sessions  It s there Want POST body   query string parsing  It s there Want easy templating through jade  mustache  ejs  etc  It s there Want graceful error handling that won t cause the entire server to crash

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1  What is Express js    Express js is a Node js framework  It s the most popular framework as of now  the most starred on NPM        It s built around configuration and granular simplicity of Connect middleware  Some people compare Express js to Ruby Sinatra vs  the bulky and opinionated Ruby on Rails      2  What is the purpose of it with Node js    That you don t have to repeat same code over and over again  Node js is a low-level I O mechanism which has an HTTP module  If you just use an HTTP module  a lot of work like parsing the payload  cookies  storing sessions  in memory or in Redis   selecting the right route pattern based on regular expressions will have to be re-implemented  With Express js  it is just there for you to use      3  Why do we actually need Express js  How it is useful for us to use with Node js    The first answer should answer your question  If no  then try to write a small REST API server in plain Node js  that is  using only core modules  and then in Express js  The latter will take you 5-10x less time and lines of code      What is Redis  Does it come with Express js    Redis is a fast persistent key-value storage  You can optionally use it for storing sessions with Express js  but you don t need to  By default  Express js has memory storage for sessions  Redis also can be use for queueing jobs  for example  email jobs   Check out my tutorial on REST API server with Express js      MVC but not by itself   Express js is not an model-view-controller framework by itself  You need to bring your own object-relational mapping libraries such as Mongoose for MongoDB  Sequelize  http   sequelizejs com  for SQL databases  Waterline  https   github com balderdashy waterline  for many databases into the stack      Alternatives   Other Node js frameworks to consider  https   www quora com Node-js Which-Node-js-framework-is-best-for-building-a-RESTful-API    UPDATE  I put together this resource that aid people in choosing Node js frameworks  http   nodeframework com  UPDATE2  We added some GitHub stats to nodeframework com so now you can compare the level of social proof  GitHub stars  for 30  frameworks on one page     Full-stack    http   sailsjs org http   derbyjs com    Just REST API    http   mcavage github io node-restify    Ruby on Rails like    http   railwayjs com  http   geddyjs org    Sinatra like    http   expressjs com    Other    http   flatironjs org  https   github com isaacs npm-www http   frisbyjs com    Middleware    http   www senchalabs org connect    Static site generators    http   docpad org https   github com jnordberg wintersmith http   blacksmith jit su  https   github com felixge node-romulus https   github com caolan petrify

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ExpressJS is bare-bones web application framework on top of NodeJS   It can be used to build WebApps  RESTFUL APIs etc quickly   Supports multiple template engines like Jade  EJS    ExpressJS keeps only a minimalist functionality as core features and as such there are no ORMs or DBs supported as default  But with a little effort expressjs apps can be integrated with different databases   For a getting started guide on creating ExpressJS apps  look into the following link     ExpressJS Introductory Tutorial

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Express is a module framework for Node that you can use for applications that are based on server s that will  listen  for any input connection requests from clients  When you use it in Node  it is just saying that you are requesting the use of the built-in Express file from your Node modules    Express is the  backbone  of a lot of Web Apps that have their back end in NodeJS  From what I know  its primary asset being the providence of a routing system that handles the services of  interaction  between 2 hosts  There are plenty of alternatives for it  such as Sails

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