Creating a custom module in Drupal 8 The undying "Hello World!"

In this tutorial I'm going to show you a step by step guide on how to create a custom module in Drupal 8 from the scratch. We are going create a custom block that display the undying "Hello World" message.

Let's get started

1. Inside your module folder(hello_world) create hello_world.info.yml file.

2. Let's make Drupal aware that our module is existing, tell something about hello_world module, copy this code and paste it on your hello_world.info.yml file.

   name: Hello World
   description: Awesome module that display blocks and page
   package: Custom
   
   type: module
   core: 8.x

    

3. Navigate to admin/modules and enable hello_world module.

4. Create HelloWorldBlock.php under src/Plugin/Block.

5. Tell something about your block to display "Hello World". Copy and paste this code snippet under your HelloWorldBlock.php file.

   <?php
   
   namespace Drupal\hello_world\Plugin\Block;
   
   use Drupal\Core\Block\BlockBase;
   
   /**
    * Provides a 'Hello World' Block.
    *
    * @Block(
    *   id = "hello_block",
    *   admin_label = @Translation("Hello World block"),
    *   category = @Translation("Hello World"),
    * )
    */
   class HelloWorldBlock extends BlockBase {
   
     /**
      * {@inheritdoc}
      */
     public function build() {
       return array(
         '#markup' => $this->t('Hello, World!'),
       );
     }
   }

6. Enable your hello world block under admin/structure/block home page.

7. Visit your home page.

   

Voila you now have your first Drupal 8 custom module.