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Gain insights into AdonisJs fundamentals. Delve into routes, controllers, middleware, and hooks. Discover practical examples, illustrations, and quizzes to confidently build your full-stack applications.

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This course is a detailed guide to AdonisJs. AdonisJs, inspired by Laravel, is a Node.js framework that allows developers to build full-stack web applications and micro-API servers. 

In this course, you will cover the fundamentals: routes, controllers, middleware, hooks, and more. Each chapter contains code examples and illustrations to enhance your learning, and you will also be able to quiz yourself on the materials covered. 

By the time you are done with the course, you'll have plenty of hands-on practice, and will be able to confidently write your full-stack applications in AdonisJs.

Building Full-Stack Web Applications with AdonisJs

Middleware is created inside the folder **app/Middleware** and registered inside the **start/kernel.js** file. 

# Creating named middleware

Let’s say we want to create authentication middleware to only let users who are logged in access our website. We will use named middleware to achieve this.

HOST=0.0.0.0
PORT=3333
NODE_ENV=development
APP_URL=http://${HOST}:${PORT}
CACHE_VIEWS=false
APP_KEY=
DB_CONNECTION=mysql
DB_HOST=mysql
DB_PORT=3306
DB_USER=root
DB_PASSWORD=root
DB_DATABASE=newsletter
DB_SOCKETPATH=
SESSION_DRIVER=cookie
HASH_DRIVER=bcrypt

'use strict'

/*
|--------------------------------------------------------------------------
| Ace Commands
|--------------------------------------------------------------------------
|
| The ace file is just a regular Javascript file but with no extension. You
| can call `node ace` followed by the command name and it just works.
|
| Also you can use `adonis` followed by the command name, since the adonis
| global proxy all the ace commands.
|
*/

const { Ignitor } = require('@adonisjs/ignitor')

new Ignitor(require('@adonisjs/fold'))
  .appRoot(__dirname)
  .fireAce()
  .catch(console.error)


'use strict'

/*
|--------------------------------------------------------------------------
| Http server
|--------------------------------------------------------------------------
|
| This file bootstrap Adonisjs to start the HTTP server. You are free to
| customize the process of booting the http server.
|
| """ Loading ace commands """
|     At times you may want to load ace commands when starting the HTTP server.
|     Same can be done by chaining `loadCommands()` method after
|
| """ Preloading files """
|     Also you can preload files by calling `preLoad('path/to/file')` method.
|     Make sure to pass relative path from the project root.
*/

const { Ignitor } = require('@adonisjs/ignitor')

new Ignitor(require('@adonisjs/fold'))
  .appRoot(__dirname)
  .fireHttpServer()
  .catch(console.error)


React

Dart

GoJS React

Typescript React

Vue.js

> Press Run and wait for the output to be displayed in the Output tab. You will see "error: Unauthorized access." You may click on the link under the Run button and write anything in place of 1. 

## Explanation

Take a look at **app/Middleware/AuthRequired.js**. The `handle` function will be called every time this middleware is involved. In the `try` block, we check to see if the user is already authenticated using `auth.check()`. If that is not the case, we return a JSON response in the `catch` block.

To use this middleware, we register it inside the `namedMiddleware` object in  **start/kernel.js**. Take a look at line 43 of **start/kernel.js**. Note that we always register every new named middleware inside the `namedMiddleware` object in  **start/kernel.js**. 

Next, we attach an existing route to the newly created `authRequired` middleware. Open **start/routes.js** and observe lines 20-22.

If we access the URL specified in line 20 of **start/routes.js**, we will get an "error: unauthorized access" response from the `authRequired` middleware that tells us we need to login first. The `authRequired` middleware executes before the closure inside the route. Since validation has already failed, we will not get a response from the closure.

Learn how to create middleware in AdonisJs

Introduction

Routing and Middleware

Controllers and Views

Request and Response

Session, Validator, and Logger

Database

Hooks, Mail, and Events

Tests

Conclusion

Appendix

Creating Middleware