6 Mistakes to avoid when building a React Native App

React Native is an open-source framework created by Facebook for building mobile applications using JavaScript and React. When moving to React Native, developers often make certain mistakes that can lead to poor app performance or a sub-par user experience. Here are some common mistakes.

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6 Mistakes to avoid when building a React Native App

React Native is an open-source framework created by Facebook for building mobile applications using JavaScript and React. It allows developers to build mobile apps that are indistinguishable from apps built using traditional, native technologies such as Swift or Java.

One of the major strengths of React Native is its ability to write code once and run it on both iOS and Android platforms. This saves development time and money. It also ensures that the app looks and feels like a native app on both platforms. It doesn't take long for JavaScript developers can become proficient in React Native. This allows skilled web developers to make the transition to becoming native developers.

When moving to React Native, developers often make certain mistakes that can lead to poor app performance or a sub-par user experience. Here are some common mistakes we've seen new developers make:

Not understanding the difference between a web view and a native view

A web view is a native component that renders web content using web technologies such as HTML, CSS, and JavaScript. A native view is a component implemented using the native platform's UI elements and APIs.

Web views can be less responsive than native views, and may not be able to access certain device features or APIs. They also may not be able to match the look and feel of the native platform.

Developers new to React Native may not realise that web views are slower and less performant than native views. To avoid this mistake, it is important to understand when to use each type of view.

We should be aware that certain functionalities may not be supported in web views. Testing your code to ensure that it works as expected will reveal this problems quickly.

Not optimising images

React Native supports a wide range of image formats, but not all of them are optimised for mobile devices. Large or high-resolution images can take up a lot of memory and slow down the app's performance. This can be a particular problem on devices with limited resources. Loading large images over a network can increase the application's load time, which can lead to a poor user experience.

By optimising images, developers can reduce the file size of images without compromising on quality. This will decrease the amount of memory used and decrease the load time. There are a variety of techniques for this. A developer can compress the images, use the right image format, and using the right image resolution for different devices.

There are also third-party libraries that help with this. React Native Fast Image can help with image loading and caching, for example. This provides a faster and more efficient image loading experience. As this improves the performance of the app, it makes the app more responsive.

Not testing on different devices

It's a great thing that React Native can target multiple platforms from a single code base. The drawback of this though is that the differences are not always clear. Developers need to consider the different ways that the app will display and be interacted with on different devices.

Different devices will have different screen sizes, resolutions, and aspect ratios - this will affect how the app is displayed. Additionally, different devices will have different hardware capabilities, such as camera, GPS, or accelerometer, which can affect the functionality of the app.

By testing on different devices, developers can identify and fix any issues that may arise due to these variations. This can help ensure that the app works correctly and consistently across a wide range of devices and platforms, which can improve the overall user experience and reduce the number of bugs that are found after the app has been released.

In addition to testing on different physical devices, developers can also use emulators and simulators to test the app on different devices and platforms. This can be useful for testing the app on devices that the developer doesn't have access to or for quickly testing different configurations.

6 Mistakes to avoid when building a React Native App

Not properly handling the state

State management in React Native can be a complex task, and there are several issues that developers may encounter when managing state in their applications. Some of the common issues surrounding state management include:

- Complexity: As the application grows, the state can become increasingly complex and difficult to manage. This can make it challenging to understand how different components are interacting with the state and how changes in the state are affecting the application.

- Inconsistency: Without proper management, the state can become inconsistent, leading to unexpected behaviour and bugs.

- Performance: Poor state management can lead to poor performance, particularly when the state is being updated frequently or when the state is being passed through a large number of components.

6 Mistakes to avoid when building a React Native App

- Scalability: As the application grows, it can become more difficult to scale the state management to handle new features and requirements.

To address these issues, some best practices for state management include:

- Keep the state as simple as possible: Try to minimize the amount of state that is required for the application and avoid storing unnecessary data in the state.

- Use a centralized state management library: Use a library such as Redux or MobX to manage the state in a centralized and consistent way. This can help simplify the management of the state and make it easier to understand how different components are interacting with the state.

- Limit the number of state updates: Try to minimize the number of updates to the state to improve performance.

- Use component state and props correctly: Use component state and props correctly, and avoid using state when props would be more appropriate.

- Use selective state updates: Use selective updates to update only the parts of the state that have changed, rather than updating the entire state.

By following these best practices, developers can improve the manageability, scalability, consistency and performance of their state management in React Native Applications.

Not using third-party libraries wisely

Deciding whether or not to use a third-party library in a React Native project can be a challenging task. On one hand, third-party libraries can provide functionality that is not available in the core React Native libraries, saving time and effort for the developers. On the other hand, third-party libraries can have a negative impact on the performance of the application, may not be compatible with the version of React Native and other dependencies that you are using and may not be actively maintained and supported.

It is important to consider the functionality that the library provides and compare it to the core React Native libraries. It is also important to check the maintenance and support of the library, as well as its compatibility with the version of React Native and other dependencies that you are using. Additionally, it is important to consider the potential impact on the performance of your application.

When it comes to picking the most appropriate libraries, research different options. Things to consider are the popularity, documentation and tutorials, and support of each library. Libraries that are widely used and have a large community of developers are generally considered to be more reliable and stable. Also, good documentation and tutorials make it easier to learn and use a library. Libraries with good support and active development are more likely to be updated and fixed when issues arise.

It is also a good idea to try out different libraries and see which one works best for your specific use case.

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Not considering security

When it comes to security in React Native, there are several considerations that developers should keep in mind.

One of the main concerns is the handling of sensitive data, such as user passwords and personal information. This data should be properly secured and encrypted both when it is stored and when it is transmitted over the network.

Another important consideration is the use of secure communication protocols such as HTTPS or SSL, to encrypt the communication between the app and the server. This can help protect against man-in-the-middle attacks and eavesdropping.

Additionally, it's important to validate any user input, and sanitise any data that is received from external sources to prevent attacks such as SQL injection and cross-site scripting.

The use of authentication and authorisation mechanisms to ensure that only authorised users have access to sensitive data and functionality within the app. This can include implementing user login and password mechanisms, as well as using access control mechanisms such as OAuth or JWT tokens.

Security is a crucial aspect of React Native development, and developers should be aware of the potential risks. They should take steps to secure sensitive data, use secure communication protocols, validate user input, implement authentication and authorisation mechanisms, and use only trusted and secure native modules and plugins.


With the right approach, React Native can be a powerful tool for building mobile apps that deliver a great user experience. However, it's important to keep in mind that there are some trade-offs to consider when using React Native. For example, it may take longer to debug and troubleshoot issues than with a native app, and there may be some limitations on the types of features that can be implemented.

In addition to the above-mentioned mistakes, it's also important for developers to stay up-to-date with the latest updates and new features in React Native. As it is an open-source framework, it is continuously evolving and new updates, libraries and tools are released regularly. Keeping up with these updates can help developers take advantage of new features and improve their skills.

React Native offers a great solution for building cross-platform mobile apps, but developers need to be aware of the common mistakes that can be made when working with this framework. By keeping in mind the strengths and limitations of React Native, and avoiding common mistakes, developers can create high-performing, user-friendly mobile apps that deliver a great user experience.

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