Express Web Application Development

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Using the application generator

For fans of simplicity, this is a big plus among all other frameworks because you can build your application with your own preference and no unnecessary learning curve. Even though the framework is un-opinionated, it does have the generator that generates specific project folder structure. After installing express-generator npm package and creating application skeleton with generator command, an application folder with clear hierarchy will be created to help you organize images, front-end static JavaScript, stylesheet files and HTML template files.

Middleware are basically just functions that have full access to both request and response objects.

As the name implies, middleware applies some filtering instruction before handing the control over to actual business logic or the next level of middleware. Some common tasks include like checking for user login status, validating user authority, or preventing cross-site attacks are best extracted as middleware.

An Express application is essentially Node. Template engines allow developer to embed backend variables into HTML files, and when requested the template file will be rendered to plain HTML format with the variables interpolated with their actual values. By default, the express-generator uses Pug originally known as Jade template engine, but other options like Mustache and EJS also work with Express seamlessly.

As a minimal framework, Express does not consider database integration as a required aspect within its package, thus it leans toward no specific database usage whatsoever. These third party database drivers do not conform to unified syntax when doing CRUD instructions, which makes switching databases a big hassle and error prone. Koa is developed by the team behind Express, and its goal is to minimize the minimalist Express by not bundling any middleware within its core. Other than being middleware-less, Koa looks very similar to Express, lightweight and un-opinionated.

However, what makes Koa truly standout is its way to ditch callback completely by using the ES6 Generator feature. Javascript is an asynchronous programming language, and with such instinct of the language itself and the single threaded event-driven mechanism of Node. One way to flatten callback nesting is to use Async. Yet Async.

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When writing Node. Another cleaner way is to use then-able Promises. Some third party Promise libraries with reputation are bluebird and q. This way, you aggregate all error handling functions to one place and get rid of callbacks thoroughly. This notion is new to JavaScript, but not new in the programming world at all. Koa is utilizing ES6 Generators to provide an elegant way to cope with JavaScript asynchronous programming, thus you cannot see callbacks in a pure Koa application.

One typical use case of ES6 Generator in Koa is middleware cascading, which allows customized middleware to execute one after another without any nasty callbacks. We cannot jump to conclusions asserting that this cutting-edge technique is superior to old school solutions such as Async. With the unconventional control flow sequence, it could bring extra difficulty to code debugging. Meteor is an all-in-one JavaScript framework. If you look closely under the hood, you will notice that Meteor is really Node. And Cordova, as the most famous HTML solution for mobile hybrid apps, bridges web pages to mobile views.

A modern single page web application tweaks the above process a little. Create an index. The install route expects a shop URL parameter, which it uses to redirect the merchant to the Shopify app authorization prompt where they can choose to accept or reject the installation request. In constructing this URL, you've used the forwardingAddress , apiKey , and scopes variables declared in the previous step. After adding the code to your index. You should be redirected to the app authorization prompt for your development shop.

The request from Shopify includes a code parameter that needs to be exchanged for a permanent access token.

Express web framework (Node.js/JavaScript)

Your app needs to validate the request by using HMAC validation to make sure that the request has come from Shopify. To validate the request, replace res. If you previously accepted the install request, then Shopify won't present you with the prompt again. Your browser should now load a page that reads HMAC validated. It's pretty straightforward, really. You've probably already worked within systems that use it. Now that we have an idea of what REST is all about, let's put it to work for us by building a stupidly simple single-page web app that's completely valueless. Kind of like half the startups in the Valley, amirite?!

Is this thing on? We're going to build a simple collection of usernames and emails, much like we did in our previous tutorial. So, let's get started. Make sure you've got the latest stable version of Node installed on your machine, then fire up a console window and navigate to wherever you're storing these web projects. The first thing we'll want to do is update Express and the Express scaffolding generator globally, like this:.

As you'll remember from this last tutorial, this is going to auto-generate a website skeleton in a new directory called nodetest2. Watch as it does its thing, and when it's done, open the newly created package. As usual, these versions are up to date as of the "last update" box at the top, and are proven to work with this tutorial. Use newer versions at your own peril! Note that we're adding the MongoDB and Monk packages so that we can access and control our database.

Looking for a handy reference for Express? I've put together a beautiful cheat sheet full of commands, along with a bunch of other great resources. Click the button below to learn more! Get Your Cheat Sheet. Watch as all your dependencies install — it'll take a while. Very exciting! After that, there's one small thing to do. In the same command prompt, just type:.


This is where we'll store our database files when we get to that point. If you'd like to store them elsewhere, that's absolutely fine … just know that you need to have the directory ready before running MongoDB.

How to Create a Nodejs Express App - Simple and Stylish Restaurant App

That's it; we're going to prepopulate the database later in this tutorial, so we're done with setup for now. It's time to get started making web pages. One final note: this article uses two-space indentation for everything because that's fairly popular in the JavaScript community.

I know this is a big debate, but honestly given how fast and easy it is to convert spaces to tabs and back again with any decent editor, I don't really see the issue. Unless your team has a standard everyone's agreed to, you should work with what you want. If we're going to have a single-page web app, the first thing we need is a single page, right?

Let's open up our views folder, and start with layout.

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This is a template file that we're only going to make a few basic changes to. Here's how it starts:. We want to be able to do two things. One: include jQuery, and two: include our master javascript file.

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So let's edit the file and make it look like this:. Astute readers may note that global. This is true. We're going to make it in a bit. For now, it'll just quietly in the background when we load our index page. Onward to index. We're going to put quite a lot of stuff onto this page.

It'll give you a basic layout to work with, which you can modify to be as pretty as your heart desires. That's not very exciting. Let's get started modifying this guy. That's kind of repetetive, so let's change the paragraph to just say "Welcome to our test". Then let's add a wrapper, and add a table skeleton for displaying a list of users:.

You'll note that there's no data in the table. So, let's get that set up, and then we'll do a little javascripting to pull things together. If you want to see what the page looks like right now, go ahead and type the following into your terminal:. If you've downloaded the CSS file mentioned above and overwritten the default stylesheet, it will look like this:. We already covered getting MongoDB up and running in the previous tutorial, so I'm going to skip right to the good stuff here.

Express Web Application Development Express Web Application Development
Express Web Application Development Express Web Application Development
Express Web Application Development Express Web Application Development
Express Web Application Development Express Web Application Development
Express Web Application Development Express Web Application Development
Express Web Application Development Express Web Application Development
Express Web Application Development Express Web Application Development
Express Web Application Development Express Web Application Development

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