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10 minutes read

React Pros and Cons: What are the Advantages and Disadvantages of ReactJS?

By Alvaro Insignares
By Alvaro Insignares
App Development
10 minutes read

Understanding the pros and cons of React is important to weigh when choosing a JavaScript framework. React has been growing in popularity due to its flexibility and efficiency, but there are other frameworks too, such as Node or Angular. React is a JavaScript library that is responsible for the view layer of mobile and web apps

React was initially developed by a software engineer working at Facebook in 2011. In 2013, React was released to the public and is now an open-source JavaScript framework. React has grown in popularity over the years because it can be used to create powerful User Interfaces that run more efficiently than other frameworks. We’ll touch on the performance and User Interface aspects of ReactJS in more detail when we look at the pros and cons of React. 

What are the Key Features of ReactJS?

Before we look at the pros and cons of React, let’s briefly look at the main features of ReactJS. This information will help understand the context of the pros and cons of this JavaScript framework in more detail, and it will help you learn more about the capabilities of React. 


JSX is a Javascript syntax extension that can be used to write HTML or XML-like text code alongside ReactJS. This additional text can co-exist within the ReactJS code and can be processed correctly by the React framework. Web developers do not need to use JSX when working with ReactJS, but many do because of the flexibility it can offer projects. 

Reusable Components

ReactJS code consists of multiple components. Each ReactJS component has its own controls and logic that are specific to the component. Components can be reused or even repurposed in other parts of the code to meet specific requirements and help maintain the order of the code, especially during larger projects that require a lot of scripts. 

Virtual DOM

DOM (document object model) manipulation is essential for modern, interactive web activities. Web apps structure their elements in DOM trees which are organized to help scripts access the various elements of a webpage. Traditional DOM manipulation required entire elements and DOM components to be re-rendered every time a manipulation occurred. A virtual DOM only re-renders the actual components that were manipulated. ReactJS uses a virtual DOM to improve memory and efficiency. 

What are the Pros of React?

Now that we have a better understanding of what ReactJS is and its key features, let’s take a look at the pros of using React. This JavaScript framework has become an essential part of front-end web development

The pros of ReactJS are: 

  • It is easy to learn.
  • A virtual DOM is used.
  • There are reusable components.
  • Operates on a one-way data flow.
  • SEO friendliness.

Easy to Learn

ReactJS benefits from being an open-source tool because any developer can create tutorials, training tools, and other documentation to help new and old developers alike learn. Developers who already possess a JavaScript background will find that they can learn the ins and outs of React in a few days

Additionally, business owners and hiring managers will have an easier time finding web developers with ReactJS experience and knowledge since the tool is open-source and easy-to-learn. The ease of learning React also benefits developers who already have a background in ReactJS too. Since React is an open-source tool, development improvements are being made constantly, so developers need to stay up-to-date on the latest improvements. 

Virtual DOM

The issue with real or traditional DOM constructs is that when they process changes, they rewrite the entire DOM tree. Modern, interactive websites and applications have complex and large DOM trees. Every time inputs or queries are made, a real DOM has to rewrite the entirety of the page, and this can hamper performance and waste memory.

The virtual DOM is much more efficient, performs faster, and ultimately creates a better User Interface. Instead of rewriting the entire DOM tree every time a change is made by a user, a virtual DOM only updates the element being manipulated. For example, let’s say that you have a checklist of ten items. A real DOM will rewrite and re-render all ten list items once one item on the list is checked. A virtual DOM only rewrites the single item that was checked instead of the entire list. 

Interactive websites are far more complex than simple lists, so you can see how a virtual DOM construct would be far more efficient at rendering a high-performing User Interface than a real DOM. The virtual DOM of ReactJS is the primary reason this JavaScript framework can create high-performance User Interfaces

Reusable Components 

Writing code for large projects is a time-consuming process. Traditionally, developers would not be able to effectively reuse code components because changes to any one component would affect all copies of that component. Imagine being an artist who has to redraw the company logo for every instance the logo is used instead of creating it one time and manipulating it to fit the specifications of your medium. 

Programming and web development projects cannot always take advantage of the efficiencies of design reuse. Small changes in one instance of a component can affect the copy of the component elsewhere. ReactJS isolates all components. This means changes or updates to one instance of a component do not affect all other instances of the same component. React allows developers to effectively reuse design components which saves them time and makes their code more accurate

One-Way Data Flow 

Most JavaScript frameworks have a multi-directional data flow. This means that data that is changed in a child element can affect the data of the larger parent element that houses it. This issue presents the possibility of unstable code.

ReactJS simplifies this problem by binding all data to downward motion. In this structure, parent data cannot be affected by changes in child elements. This creates a more stable code and gives developers more control over large and complex projects. 

SEO Friendly

Search ranking is an important aspect of web development for business owners. Websites need to do more than function well. Websites also need to perform well in organic search results in order to attract users and drive business goals. Traditional JavaScript-heavy websites are difficult for search engines to read. This has been a major complaint of web developers. 

ReactJS mitigates the issue of overly heavy JavaScript websites and is readable by Google and other search engines. If you’re still concerned about how your web application is performing on Google’s search results pages, you can use the indexing tools on Google Search Console to see how Google reads your website and the ways it can be improved. 

What are the Cons of React?

We’ve explored the major pros of using React, from its high-performance capabilities and reusable components to its easy-to-learn syntax and SEO friendliness. However, there are a few cons associated with ReactJS that we would like to touch on briefly as well to give you a complete picture of ReactJS before you begin working with it. 

These are the cons of React:

  • JSX syntax.
  • Fast development pace.
  • Somewhat slow documentation.


While the JSX syntax extension makes things easier for some developers, there is another group of developers that find JSX to be a disadvantage of React. Some web developers and designers find the JSX code to be too complex and difficult to grasp. 

Many new developers find JSX to be a barrier to mastering ReactJS. While this might be a con to some developers, it is important to note that JSX has its benefits too, and helps protect the code from injections

The primary complaint about JSX is its difficulty. JSX doesn’t negatively impact the performance or User Interface capabilities of ReactJS. This con is more of a preference than anything else. 

Development Pace

ReactJS is constantly evolving and changing. The pace at which React is developed can be seen as an advantage or a disadvantage depending on who you are. The developers who see this explosion of development as an advantage would argue that React is constantly being improved and making their jobs easier. The developers who see the pace of development as a disadvantage would argue that they have to constantly relearn how to work with ReactJS, and it is difficult to keep up with. 

The pace of ReactJS’s development is a common disadvantage that is brought up, but it should be noted that in recent years React’s core API has gotten a lot more stable. Most updates today affect the library and new features. Some developers are not happy with the pace of change, nor are they comfortable trying to keep up with new developments. While you may commonly hear that React develops too quickly, it is important to note that new developments improve the framework and help make it perform at a higher level. 


This con is tied to the problem people have with the pace of React’s development. As a result of rapid development, educational documentation and resources can be sparse in covering the latest updates and changes

Since ReactJS is an open-source framework, developers are able to create their own support documents, but since anyone can create these resources, you could come across poor resources that offer little help. 

Once again, this disadvantage of React depends on your circumstances and how you view innovation and development. Is React developing so quickly that sometimes proper documentation cannot keep up? Yes. However, I tend to believe that progress is a positive thing, especially when it comes to creating dynamic web and User Interface experiences. You can find user-created support resources for many of the questions or issues you may have while using React. 

Can React be Used for Mobile Development?

ReactJS is used to create web apps. In 2015, React Native was released to be the React mobile development solution. React Native is a hybrid app development framework that gives developers the ability to reuse over 90 percent of their code in both iOS and Android app development projects. React Native takes advantage of native APIs to bridge the gap between JavaScript and platform-specific languages such as Java or Objective-C. 

React Native is one of the most efficient and powerful mobile app development environments. The hybrid apps created using React Native render some parts of the code in the native language of the specific platform. This aspect of React Native creates a more powerful app, a faster app, and ultimately an app with a better User Experience than other hybrid app development frameworks.

Final Thoughts

ReactJS is a very efficient development framework that can be used to help developers create faster web apps with powerful User Interfaces. There are pros and cons of React, but I think many of the cons associated with ReactJS are due to people not liking rapid changes. There is nothing wrong with constant development. You could make the argument that rapid development is one of the strongest advantages of React. Technology improves at an exponential rate. Newer technology will develop even more rapidly than ReactJS. Development is an exciting step towards the new future of tech. 

The biggest drawbacks of ReactJS are due to human preferences. In terms of performance and output, there are no major disadvantages to using React versus another JavaScript framework

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