Drupal Custom Module Development: A Comprehensive Guide

Drupal Custom Module Development: A Comprehensive Guide

Drupal’s modules are what gives it its power. Drupal developers may quickly implement the thousands of core and contributed modules that best suit their needs. What happens, though, if the specifications are really specific and you don’t have a module for it? How may a Drupal website be modified for a client whose special requirements just cannot be met by contributed or core modules? Introducing Custom Modules.

With Drupal 9, you have the freedom to modify or add new features as needed to meet the specific and expanding needs of your business. Custom Drupal modules encourage innovation and improvements to aid businesses in broadening their horizons. You can use this article as a starting point to create your own Drupal 9 module.

Getting Started With Drupal 9 Module Development

Let’s begin by constructing a custom module in Drupal 9 using a few simple steps:

Step 1: Set A Drupal 9 Module Name 

In the ‘web/modules/custom’ folder, a custom module must first be created. We’ll give the folder that name: welcome_module

Drupal custom module development

Before giving your module a machine name, you should consider the following:

  • It shouldn’t begin in capital letters.
  • The words shouldn’t have any spaces in between them.

Step 2: Get noticed with the info.yml file

For Drupal to be able to detect our module, we must produce a yaml file specifying its machine name. We have created a file named welcome_module.info.yml.

Here is the welcome_module.info.yml file we produced in the step one “welcome” directory.

name: Welcome Module

type: module

description: ‘First Custom Drupal 9 Module.’

package: Custom

version: 1.0

core_version_requirement: ^8 || ^9

Step 3: Creating the routing file with routing.yml

The following step is to add a welcome_module.routing.yml file to the directory “welcome”:


  path: ‘/welcome/page’


    _controller: ‘\Drupal\welcome_module\Controller


    _title: ‘Welcome to My Module in Drupal 9’


    _permission: ‘access content’

The route name [welcome_module.my_welcome] appears on the first line.

The URL path we want this route to register is specified under path. The route’s URL is as follows.

Two items are listed under defaults: the default page title (_title) and the _controller, which refers to a method on the WelcomeController class.

We specify the accessing authorization under prerequisites. The page must be viewable by the user.

Step 4: Adding A Controller

“Modules/Custom/Welcome_Module/src/Controller” should be created. Make a file called “WelcomeController.php” in this subdirectory with the following information in it:


namespace Drupal\welcome_module\Controller;

class WelcomeController {

  public function welcome() {

    return array(

      ‘#markup’ =—-> ‘Welcome to our Website.’




Now To enable your module, log in to your Drupal website. Visit the URL you specified in your routing file, which is /welcome/page, to verify that it is working properly. If you get the ‘Page Not Found’ issue, go to admin->configuration->performance to clear the cache. Repeat the test, and it ought to work correctly this time.

Drupal module development

How Appic Softwares Can Help You With Drupal Development?

Appic Softwares is a leading Drupal development company that will enable you to handle all your technical Drupal needs. We have worked across various industries and have handled several clients across the globe. 

Moreover, you can even hire dedicated Drupal developers from us and let them work solely on your project. So, what are you waiting for?

Contact us now!

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