4 Web Application Design Patterns for Your Business

Anna Peck

For web development projects, it can be difficult for businesses to know where to start. Web application design patterns are a great starting point for teams with all levels of experience. Read through four types of web application design patterns and their best practices. 

To guarantee a successful web development project, companies need to invest in web application design patterns. 

Even the most skilled developers can have a hard time, especially if the technology is difficult or if there’s way too much information for a development team to manage. 

Web application design patterns are useful to create certain conventions and templates for projects. Since there are many different programming languages such as C# out there, a web application design pattern can help set expectations for code and more aspects of the project. 

This article will cover four types of web application design patterns and their best uses.

4 Types of Web Application Design Patterns

  1. Singleton design pattern
  2. Observer design pattern
  3. Strategy design pattern
  4. Decorator design pattern

The Singleton Design Pattern

The definition of a singleton design pattern is all in the name. The singleton design pattern only allows a class or object to have a single instance. 


The goal of a singleton design pattern is to regulate the global state of an application. It also prevents multiple components and logs from being active at the same time, which can lead to weird bugs. 

An example of this web application design pattern is a logger, which is a string of entries or messages within a system. 

For developers working with a singleton design pattern, there is no need to worry about receiving logs from the main app. Users can get them from anywhere in their codebase, and there isn’t any room to worry about logs getting lost. 

The Observer Design Pattern

An observer design pattern is a relationship that many web app or mobile application users encounter regularly. 

The goal of the observer design pattern is to create a relationship between a subject and their observers. The observers are set to wait for updated data. If the subject changes, the observers are notified almost instantly. 

For example, if a business sends out a user notification or updates a subscription policy, the observer design pattern is in effect. 

This is also used with filters and dropdowns. If you’re looking to buy new clothes or shoes, you select what you’re looking for by a drop down menu.

drop down

Popular clothing sites like Madewell use a variety of unique filters to meet their customers’ needs.

The observer design pattern is needed for any web application that needs direct user interaction. 

The Strategy Design Pattern

The strategy design pattern is an advanced implementation that is also dependent on the client or user.

It runs similarly to an “if-then” statement. If a client does this, they will be lead down this path, or if a user chooses this, then they will complete this action. 

Companies must think strategically by factoring in all different user journeys for their clients. 

An example would be payment methods. Long ago,  online shopping was simple. Buyers would use their credit or debit cards to make a purchase. Now, with a multitude of options like Apple Pay, buyers can’t be restricted to one method. 

With a strategic design pattern, developers can dynamically change the strategy being used during run time. If only a payment option for credit cards comes up, your business might lose buyers. But, if they’re given options, they’re more likely to make a purchase.

Despite all of the potential options with this web application design pattern, it still provides the right amount of flexibility like bespoke website design themes and not a lot of confusion. 

The Decorator Design Pattern

Using the decorator design pattern is as simple as a classic Turkey sandwich. 

A decorator design pattern starts with a base class but allows instances of new methods and properties. For a real life example, have you ever ordered food during a busy lunch rush?

Those food platforms likely use a decorator design pattern. If you’re ordering a burger with special toppings, the web app isn’t adding those ingredients to every single burger that’s being ordered at that specific time. 

The decorator design pattern allows users to change the base without affecting any other classes or properties. 

Create Web Application Design Patterns for Your Website

Have you considered using web application design patterns for your project's website strategy

Web application design patterns add flexibility to complex projects, implement structure, and work well with customizations. These design patterns also improve readability and reduce learning time for developers.

While there isn’t a one-size-fits-all solution with these design patterns, they can help developers adjust to challenges and adapt their website methodologies

Overall, these web application design patterns increase productivity and efficiency.


Anna Peck

Senior SEO Specialist at Clutch.co
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