Apart from having a friendly user interface, Drupal also serves as a front-end for many of the technologies, frameworks and APIs. Besides the numerous advantages Drupal has, it also allows developers to make use of other technologies outside of the Drupal platform. MuleSoft, Alfresco, Ruby on Rails, AngularJS, and Python are among the technologies that can easily be integrated with Drupal development. Drupal can easily consume SOAP, REST, JSON, XML-RPC and many others.
How Does Drupal Manage To Achieve This?
1. Drupal has out-of-the-box RESTful service
Drupal can easily be integrated with other non-Drupal technologies using RESTful API, which allows developers to consume data from RESTful source. For instance, it is possible to have a Drupal web service running in the background, and exposing the data (such as content) from a Drupal page by connecting to AngularJS service using HTTP methods. This way, we consume data from a Drupal site, expose it using RESTful service, and show it on a page running AngularJS with the whole advantage it brings. How cool is that? Not only AngularJS, but it is also possible to integrate MuleSoft using Cloud Integration using REST services. In fact, Drupal 8 makes it much easier to connect a Drupal website to a RESTful service with its REST export display feature available from the Views.
2. Numerous of modules for integration
You can configure your Drupal site to consume web services by using contributed Drupal modules for each application you like to consume. Services module is one of the easiest ways to integrate external applications with Drupal. Services module allows you to migrate data created in other languages into Drupal website. This module makes its service callback with multiple interfaces like REST, SOAP, JSON, XML-RPC. For example, a Java application with an XML-RPC request can be integrated into a Drupal site using Services module. The same could be done to access a service from Python. Services module also allows developers to integrate mobile phone applications. There are also technology-specific modules available on the Drupal community.
3. Easy to build custom module
Modules are the key elements that makes Drupal such a powerful and widely-adopted Content Management System. There are more than 15,000 modules (and counting) available on the Drupal website. Yet, if you are not able to find the one that does what you need, you can benefit from thousands of tutorials available online to create your own module to integrate your technology into Drupal site. Guzzle, a PHP HTTP client that consumes RESTful from web, might be a good start into building a custom module. It is very easy to install and all you need to do is make an HTTP request to consume a webservice lies on that URL.