5 Most Common React Native Issues that starters face

When you start building code to React Native, there are some common issues that you face. When I worked on my first React Native application,  I trembled to see that RED screen literally meaning like DANGER So, here, we will be discussing some of the common problems and ways to solve them. Here we go…!
Let’s Begin with your nightmares (well I mean Issues!):
1. App Registry Error in React Native=>
As you create your application and run it, you may face an issue stating, “Your App is not registered.” The reason for this lies in your core process while creating application i.e., the application name in your app.json file. Just correcting the name itself will resolve this issue.
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2. Development Server Error in React Native=>
If you see a screen like as shown in image for Development Server Error, saying “could not connect to the development server,” then it’s an issue with your metro bundler, and you need to restart it to resolve the issue. For this, just close your previous metro bundler => Navigate to “Your Project Directory” => hit command => “npm start” and you are good to go. Again, in another tab, just run “react-native run-android/react-native run-ios” for running your application.
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3. Library Error (Packages not installed properly) in React Native=>
While using React Native Firebase library, let’s say for Push Notifications, you will get some issues like “FirebaseCore.h not found” or “Firebase.h not found.” For issues like this, its an indication that your library is not properly installed or linked. To resolve these kinds of problems, you just need to re-install and re-link your library manually again instead of linking it automatically.
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4. Undefined is not an object error in React Native =>
Many times, you will see an error saying “Undefined is not an object,” which just means that some of your references are not adequately defined or declared correctly. The variable it is referring to can be found out in the issue description as shown in image.  
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5.  The module is not found an error in React Native=>
Many times, you will create your .js files in a hurry, and while using them, you forget to give correct path and Boom, the issue arises. So don’t get confused, provide the right file path for files, and you will be good to go.
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By the way, I love building in React Native. Here are the advantages of React Native App
1. Faster to Build
One of the best parts is that React Native reduces development time. The framework delivers various ready-to-apply components that accelerate the app development process.
2. One Framework, Multiple Platforms
It allows you to cannibalize the codebase between Android and iOS. Depending on the radius of Native modules in-app, full cross-platform development is functional to a certain extent.
In practice,  full cross-platform app development is possible to some extent, depending on how many native modules you use in your application.
3. Hot Reloading
With hot reloading, a developer can keep the application running while applying the latest versions and tweaking the UI; this makes all the changes visible instantly, and there is no need to rebuild the app.
4. Smaller Teams
While building React Native app, you will primarily require JavaScript developer, who can write the development code for both mobile platforms. So, if you are developing a React Native app, then you don’t need a big team to complete the processes.
5. Simplified UI
React Native app is completely based on creating a mobile user interface. In native app development, you will need to follow a sequence of actions in the app. RN employs declarative programming in which such an order of implementing actions is obsolete. As a result, it is much easier to spot bugs on the paths a user can take.
Let’s Conclude :
So that’s all for now as it’s an endless journey of issues to work on as a Developer. I hope I am able to change your RED signal of issues to the GREEN signal of solutions and resolved at least some of the basic issues we encounter. And as I mentioned, React Native has great advantages, so I suggest you embrace React Native.
Let me know if you have more problems,  suggestions or changes. Keep Spreading Knowledge and Happy Coding!!

About Author

author-shivangi
Shivangi Agrawal
Shivangi is React Native developer with over 3.5+ work of experience with good knowledge in Android, React Native applications. She is proficient in requirement analysis, application development and maintenance, functional studies. She is dedicated to continuously developing, implementing and adopting new technologies to maximize development efficiency and produce innovative applications. she is self-motivated, quick learner and she loves to resolve technical issues.
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