Drupal is one of the most popular open-source content management systems (CMS) used to build secure, scalable, and content-rich websites. The 2026 Drupal interview questions and answers below cover the latest Drupal concepts, including modern development practices, modules, themes, security, performance optimization, APIs, and real-world scenarios to help you prepare confidently for technical interviews.
Drupal Interview Questions (Basic)
This first part covers basic Drupal Interview Questions and answers.
Q1. Explain’ Core’ in Drupal briefly.
Answer:
Drupal uses “Core,” which provides many features and functions. Drupal is based on Core modules, themes, Auto-update notifications, database abstraction, and accessibility. The core module offers features such as advanced search, books, blogs, comments, a Multi-level menu system, multi-site support, multi-user content creation, security, the new update, workflow tools, user profiles, access static, and logging. The core theme will provide a different look and feel for websites and blogs.
Q2. What are Node and Block in Drupal?
Answer:
In Drupal, the term “node” refers to any new story, page, forum topic, or other type of website content. The node module allows users to add, remove, and edit content. Regions are specific areas on a website, such as the left sidebar, header, and footer, where users can configure which data to display in various places on the page.
Let us move to the following Drupal Interview Questions.
Q3. Explain PDO.
Answer:
PDO is the PHP Data Objects. It is a consistent way to access the database. It helps the developers to write code more efficiently. It is like a data access layer that uses a unified API. Drupal provides a database abstraction layer, which helps developers work efficiently with multiple database servers. It is used to preserve the syntax and power of SQL and to work with complex functionality. It provides a well-defined interface for dynamic queries, with security checks and best practices.
Q4. What are the features of Drupal?
Answer:
The main features are listed below:
- Easy to develop and manage the site.
- Open source and readily available.
- Highly flexible, creative, and effective website display.
- It can be used in multilingual environments.
- Performance is better.
- More secure.
- Easily editable and has better support.
Q5. Explain the responsive theme in Drupal.
Answer:
It is about developing compatible websites across monitor sizes, screen resolutions, and platforms such as computers, tablets, and mobile devices. The website, once set in Drupal, can be used for any platform. Themes like this give one a look at one site for each forum without doing anything extra.
Q6. Explain the working of Caching in Drupal.
Answer:
Caching improves website performance when loading pages. The different types are:
- Page caching: –
-
- It can be used by anonymous users if it’s enabled.
- It enables the entire HTML page to be stored in a database, reducing the number of queries required.
- Block caching: –
- When a block is created by views, cache settings for a block in pictures can be set.
- Use block_cache_altermodule to fix this for each block.
- The block cache settings will be used if it’s enabled.
- Minimum cache Lifetime: –
- Amount of time before the page cache is cleared.
- Page caches get cleared on each cron run.
- Expiration of Cached pages: –
- Applies to an eternal mechanism, such as a browser cache.
- The setting will only be effective when the page cache is enabled.
Drupal Interview Questions (Advanced)
Let us now have a look at the advanced Drupal Interview Questions.
Q7. Briefly explain Drush, Drupal weight, and Drupal Cron.
Answer:
Drush is a UNIX scripting interface for Drupal. It is a command-line shell. It is mainly helpful for those working primarily with command-line tools.
Drupal weight indicates the priority or order for processing a block or node’s particular function and display.
Drupal Cron executes commands or scripts automatically at specific dates and times.
Q8. Explain the disadvantages of Drupal.
Answer:
The disadvantages are:
- Drupal is not compatible with other software.
- Drupal does not have a user-friendly interface.
- It needs good knowledge of the platform to install and modify.
- Developing a website in Drupal requires extensive knowledge.
- It has a high learning curve.
- Drupal generates more server loads and cannot open with a slow internet connection.
Q9. Define the patch and explain how to apply it in Drupal.
Answer:
With the help of patches, changes to Drupal core, such as additions and deletions, can be made. The program changes the other copy of a primary or original file in a structured, standardized way, resulting in differences.
Let us move to the following Drupal Interview Questions.
Q10. Where to use the theme hook, and what is the use of that file?
Answer:
To override the theme functions not listed in the essential list, this PHP file must start with the opening PHP tag and inform the PHP template.
Q11. Difference between WordPress and Drupal?
Answer:
The difference between WordPress and Drupal is:
| S.NO. | WordPress | Drupal |
| 1 | WordPress has a front controller architecture. | Drupal has Presentation abstraction Control architecture. |
| 2 | WordPress is written in PHP and uses MySQL. | The creators of Drupal wrote it in PHP using the Symphony framework. |
| 3 | WordPress is not available in Multi-languages | Drupal is available in Multi-languages. |
| 4 | WordPress has been used for a variety of websites and applications. | Drupal is often considered an ideal platform for developing large, complex, content-heavy websites. |
| 5 | WordPress themes and plugins really help in better customization. | Drupal provides fewer features for customization. |
| 6 | The WordPress user interface is more user-friendly. | A Drupal user interface is less friendly than WordPress. |
Q12. What is Composer, and why is it important in Drupal?
Answer:
Composer is PHP’s dependency management tool used to install, update, and manage Drupal core, contributed modules, themes, and third-party libraries. Modern Drupal projects rely on Composer to ensure version compatibility, simplify upgrades, and maintain consistent development environments across teams.
Q13. What is Twig in Drupal?
Answer:
Twig is Drupal’s default templating engine. It separates presentation from business logic, making themes more secure, readable, and maintainable. Developers use Twig templates to customize page layouts, blocks, nodes, and other website components without embedding PHP directly in template files.
Q14. What are the Configuration Management features in Drupal?
Answer:
Configuration Management allows developers to export website settings into YAML files and import them into other environments. This makes it easier to synchronize configurations between development, testing, and production servers while supporting version control and collaborative development.
Q15. What is a Headless Drupal architecture?
Answer:
Headless Drupal uses Drupal as a backend content repository, while frontend applications are built with frameworks such as React, Vue, or Angular. Content is delivered through REST API, JSON:API, or GraphQL, providing faster, flexible, and multi-platform digital experiences.
Q16. What are Drupal modules?
Answer:
Modules are reusable extensions that add functionality to a Drupal website. Core modules provide built-in features, while contributed modules add community-developed capabilities. Custom modules are created to implement business-specific functionality without modifying Drupal core.
Q17. How does Drupal improve website security?
Answer:
Drupal includes role-based access control, input validation, database abstraction, CSRF protection, secure password hashing, and regular security updates. Developers further enhance security by keeping Drupal core, modules, themes, and Composer dependencies up to date.
Q18. What is the Entity API in Drupal?
Answer:
The Entity API provides a standardized way to create, manage, store, and retrieve content entities, including nodes, users, taxonomy terms, media, and custom entities. It simplifies development by offering consistent APIs for data management.
Q19. How can you improve Drupal website performance?
Answer:
Performance can be improved by enabling caching, using BigPipe, optimizing images, compressing CSS and JavaScript, using a CDN, enabling OPcache, optimizing database queries, and keeping unnecessary modules disabled.
Q20. What is JSON: API in Drupal?
Answer:
JSON: API is a core Drupal module that automatically exposes website content as RESTful JSON endpoints without requiring custom code. It is widely used for headless Drupal applications and mobile app integrations.
Q21. What are the latest Drupal best practices for 2026?
Answer:
Modern Drupal development emphasizes using Composer for dependency management, creating custom modules rather than modifying core, adhering to coding standards, enabling automated testing, implementing CI/CD pipelines, using Drupal 11-compatible modules, applying security updates regularly, and optimizing performance through caching and an API-first architecture.
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