Node.js: from express to koa

This session will show you a few http frameworks, mainly from express to koa. How they work, a few examples with source code, my personal experiences with pros and cons to maybe make your decision a bit easier.

Transcript

1. Page 1
   Node.js
   From express to koa:
   http frameworks
   MNUG, April 2016, München
   22-Apr-16 Node.js – from the Beginning
   

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2. Page 2
   §  Robert Prediger
   §  20 years: Progress
   §  15 years: Web development
   §  5 years: Node.js
   §  robert.prediger@web4biz.de
   22-Apr-16
   Introduction
   Node.js – from the Beginning
   

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3. Page 3
   Fast, unopinionated, minimalist
   web framework for Node.js
   Minimal and flexible Node.js web application framework
   that provides a robust set of features for web and mobile
   applications.
   http://expressjs.com/
   Node.js – from the Beginning
   express
   22-Apr-16
   

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4. Page 4
   express
   22-Apr-16 Node.js – from the Beginning
   favicon
   Static-Files
   Log
   Process Request
   ... (other middleware modules)
   

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   var express = require('express'),
   app = express();
   app.use( function( req, res, next ) {
   var start = new Date;
   console.log( "way down", req.url );
   next();
   console.log( 'way back' );
   console.log( 'Response-Time', new Date - start );
   });
   app.get( "/", function( req, res ) {
   console.log( "req" );
   res.send( "Hello World" );
   });
   app.listen( 80 );
   Node.js – from the Beginning
   express
   22-Apr-16
   

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6. Page 6
   var express = require('express'),
   app = express();
   app.use( function( req, res, next ) {
   var start = new Date;
   console.log( "way down", req.url );
   next();
   console.log( 'way back' );
   console.log( 'Response-Time', new Date - start );
   });
   app.get( "/", function( req, res ) {
   process.nextTick( function() {
   console.log( "req" );
   res.send( "Hello World" );
   });
   });
   app.listen( 80 );
   Node.js – from the Beginning
   express
   22-Apr-16
   

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   var express = require('express'),
   app = express();
   app.get( "/rest/:table", auth, function( req, res ) {
   res.send( "Request: " + req.params.table );
   });
   app.get( "/rest/:table/:id", auth, function( req, res ) {
   res.send( req.params );
   });
   app.get( "/", function( req, res ) {
   console.log( "req" );
   res.send( "Hello World" );
   });
   app.listen( 80 );
   Node.js – from the Beginning
   express
   22-Apr-16
   

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8. Page 8
   ...
   function auth( req, res, next ) {
   // Database request
   db.collection.find( “user“, { user: req.session.userid }, function( err, data ) {
   // no user found
   if (err || !data) {
   console.log( “Not a valid user!“ );
   return res.status( 500 ).send( “Not a valid user!“ );
   }
   // valid user -> go down the chain
   console.log( “Valid user!“ );
   next();
   });
   }
   Node.js – from the Beginning
   express
   22-Apr-16
   

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9. Page 9
   ...
   // auth
   function auth( req, res, next ) {
   // check for user
   if (!req.query.user) {
   console.log( "Not a valid user" );
   res.status( 500 ).send( "Not a valid user" );
   return;
   }
   // valid user
   console.log( "Valid user" );
   next();
   }
   Node.js – from the Beginning
   express
   22-Apr-16
   

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    var express = require('express'),
    app = express() ,
    router = express.Router();
    // use router with prefix
    app.use( "/rest", auth, router );
    router.get( "/:table", function( req, res ) {
    res.send( "Request: " + req.params.table );
    });
    router.get( "/:table/:id", function( req, res ) {
    res.send( req.params );
    });
    app.get( "/", function( req, res ) {
    console.log( "req" );
    res.send( "Hello World" );
    });
    app.listen( 80 );
    Node.js – from the Beginning
    express
    22-Apr-16
    

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    Enterprise Node to Power the API
    Economy
    No matter where you are in the lifecycle of developing
    APIs with Node, StrongLoop has a complete set of
    command-line and graphical tools that can work together
    or independently to help you succeed.
    https://strongloop.com/
    Node.js – from the Beginning
    StrongLoop
    22-Apr-16
    

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    Strongloop
    Node.js – from the Beginning
    22-Apr-16
    

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    Strongloop
    Node.js – from the Beginning
    22-Apr-16
    Source: https://strongloop.com/node-js/arc/
    

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    Strongloop
    Node.js – from the Beginning
    22-Apr-16
    Source: https://strongloop.com/node-js/arc/
    

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    The web framework of your dreams
    Built for developers by a giant squid.
    Sails makes it easy to build custom, enterprise-grade
    Node.js apps. It is designed to emulate the familiar MVC
    pattern of frameworks like Ruby on Rails, but with
    support for the requirements of modern apps.
    http://sailsjs.org/
    Node.js – from the Beginning
    SailsJS
    22-Apr-16
    

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    SailsJS
    Node.js – from the Beginning
    22-Apr-16
    Source: https://www.manning.com/books/sails-js-in-action
    

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    SailsJS
    Node.js – from the Beginning
    22-Apr-16
    Source: https://www.manning.com/books/sails-js-in-action
    

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    next generation web framework for
    node.js
    Koa is a new web framework designed by the team
    behind Express, which aims to be a smaller, more
    expressive, and more robust foundation for web
    applications and APIs.
    http://koajs.com/
    Node.js – from the Beginning
    Koa
    22-Apr-16
    

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    var koa = require('koa'),
    app = koa();
    app.use( function *(next){
    var start = new Date;
    yield next;
    var ms = new Date - start;
    this.set('Response-Time', ms + 'ms');
    });
    app.use( function *(){
    this.body = 'Hello World';
    });
    app.listen( 80 );
    Node.js – from the Beginning
    Koa (1.x)
    22-Apr-16
    

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    var Koa = require('koa'),
    app = new Koa(),
    co = require('co');
    app.use( co.wrap( function *( ctx, next){
    const start = new Date;
    yield next();
    var ms = new Date - start;
    console.log( 'Response-Time', ms );
    }));
    app.use( ctx => {
    ctx.body = 'Hello World';
    });
    app.listen( 80 );
    Node.js – from the Beginning
    Koa (2.x)
    22-Apr-16
    

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    npm install koa-router
    /opt/dev/test
    └── koa-router@5.4.0
    npm install koa-router@next
    /opt/dev/test
    └── koa-router@7.0.1
    Node.js – from the Beginning
    Koa – middleware modules
    22-Apr-16
    

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    const Koa = require('koa'),
    app = new Koa(),
    co = require('co'),
    Router = require('koa-router'),
    router = new Router({
    prefix: "/rest"
    });
    router.get( "/:table", function( ctx ) {
    ctx.body = "Request: " + ctx.params.table;
    });
    router.get( "/:table/:id", function( ctx ) {
    ctx.body = ctx.params;
    });
    app.use( router.routes() );
    app.use( ctx => {
    ctx.body = 'Hello World';
    console.log( 'req' );
    });
    app.listen( 80 );
    Node.js – from the Beginning
    Koa - Router
    22-Apr-16
    

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    The Web framework beyond your dreams
    ThinkJS is the first Node.js MVC framework that
    supporting use full ES6/7 features to develop Node.js
    application.
    https://thinkjs.org/
    Node.js – from the Beginning
    ThinkJS
    22-Apr-16
    

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    ThinkJS
    Node.js – from the Beginning
    22-Apr-16
    

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    ThinkJS
    Node.js – from the Beginning
    22-Apr-16
    

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    ThinkJS
    Node.js – from the Beginning
    22-Apr-16
    

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    Disadvantages
    Even though ThinkJS has many advantages, it has also a few
    disadvantages too, for example:
    •  ThinkJS is a relatively new framework, the
    community is not strong enough.
    •  ThinkJS is short of large scale applications.
    Node.js – from the Beginning
    ThinkJS
    22-Apr-16
    

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    Build powerful back-end with no effort.
    Fast. Reusable. Easy to use.
    The next generation framework for Node.js
    built on top of Koa.
    http://strapi.io/
    Node.js – from the Beginning
    strapi
    22-Apr-16
    

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    strapi
    Node.js – from the Beginning
    22-Apr-16
    

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    strapi
    Node.js – from the Beginning
    22-Apr-16
    

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    strapi
    Node.js – from the Beginning
    22-Apr-16
    

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32. Page 32
    22-Apr-16 Node.js – from the Beginning
    That‘s it J
    Thank you very much for listening
    robert.prediger@web4biz.de
    Sourcecode:https://github.com/web4biz/Node.js-FromTheBeginning
    

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