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What are the best debugging practices for React Native apps?

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React Native is a popular framework for building cross-platform mobile apps with JavaScript and React. However, developing and debugging React Native apps can be challenging, especially if you are new to the platform or have complex features. In this article, you will learn some of the best debugging practices for React Native apps that will help you find and fix errors, improve performance, and enhance user experience.

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Dayo Jaiye

Software Engineer | FullStack | React | React Native | JavaScript | VueJs * NUXT | TypeScript | Developer Advocate |
Pratheesh Russell

Senior Engineer at Qburst

1 Use the React Native Debugger

The React Native Debugger is a standalone app that combines the Chrome DevTools, React DevTools, and Redux DevTools in one interface. It allows you to inspect and modify the state and props of your components, view and dispatch actions, monitor network requests, set breakpoints, and evaluate expressions. You can install the React Native Debugger from its GitHub repository and follow the instructions to connect it to your app.

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Dayo Jaiye

Software Engineer | FullStack | React | React Native | JavaScript | VueJs * NUXT | TypeScript | Developer Advocate |
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I'm a fan of React Native Debugger because it's like having a trusty sidekick in the world of app development. Its seamless integration with React Native allows me to dive deep into the app's inner workings, inspect state changes, track API calls, and squash bugs with finesse. The clean interface and robust debugging tools make the development journey smoother, turning what could be a debugging ordeal into a more enjoyable and efficient process. It's not just a tool; it's a companion that empowers me to build better React Native apps with confidence.

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2 Enable Hot Reloading and Live Reloading

Hot reloading and live reloading are two features that make developing React Native apps faster and easier. Hot reloading preserves the app state and only reloads the changed components when you save your code. Live reloading reloads the entire app when you save your code, but it also refreshes the app when you shake your device or press a keyboard shortcut. You can enable or disable these features from the developer menu, which you can access by shaking your device or pressing Cmd+D on iOS or Ctrl+M on Android.

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3 Use Console Logs and Alerts

Sometimes, the simplest way to debug your React Native app is to use console logs and alerts. Console logs print messages to the terminal or the debugger console, while alerts display pop-up messages on the device screen. You can use console logs and alerts to check the values of variables, track the execution flow, or catch errors. However, you should avoid using too many console logs and alerts, as they can affect the performance and user experience of your app. You should also remove them before deploying your app to production.

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Pratheesh Russell

Senior Engineer at Qburst
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An effective strategy is to implement a custom logging class that allows you to toggle debugging output on or off, specifically in production. This class can be designed to have different verbosity levels (e.g., debug, info, warning, error) to categorize the log messages. During development, you can set it to verbose mode to capture detailed logs for debugging purposes. However, when preparing your app for production deployment, you can easily switch the logging class to a more minimal or silent mode to ensure that no debugging information is exposed to end-users. This approach ensures that your debugging efforts don't impact the app's performance or user experience in the production environment.

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4 Use Error Boundaries

Error boundaries are React components that catch errors in their child components and display a fallback UI instead of crashing the app. Error boundaries can help you handle unexpected errors gracefully and provide useful information to the users and developers. You can create your own error boundary component by using the static method componentDidCatch, which receives the error and the error info as arguments. You can also use a third-party library like react-native-error-boundary to simplify the process.

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5 Use a Testing Framework

Testing is an essential part of debugging and ensuring the quality of your React Native app. A testing framework can help you write and run automated tests that verify the functionality, performance, and usability of your app. There are many testing frameworks available for React Native, but some of the most popular ones are Jest, React Native Testing Library, Detox, and Appium. You can choose the testing framework that suits your needs and preferences, and follow the documentation to set it up and use it.

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6 Use a Crash Reporting Tool

A crash reporting tool can help you monitor and analyze the crashes that occur in your React Native app, especially in production. A crash reporting tool can collect and send crash reports to a dashboard, where you can view the details of each crash, such as the device, OS, app version, stack trace, and user feedback. You can also use a crash reporting tool to track and resolve issues , communicate with users, and improve your app stability. Some of the most popular crash reporting tools for React Native are Sentry, Firebase Crashlytics, and Bugsnag.

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7 Here’s what else to consider

This is a space to share examples, stories, or insights that don’t fit into any of the previous sections. What else would you like to add?

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Fuad Ahmed Hasni

Software Product Specialist | SaaS
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Logging —————- Since the article is about debugging, Native debugger and Console helps you alot at development stage. For production grade debugging, it is always advisable to procure a decent logging framework within the app. Once you are in Alpha or Beta you cannot ask end users to reproduce the issue in the app especially when it has been distributed through stores. A log collection and on demand uploads mechanism allows you to go back in time and trace what had happened. Often saves a lot of time and effort in reproducing the bug. This should not be confused with with either Crash Log collection or Telemetry but proper operation logging that goes to a stream switchable from Console to File or any other Target needed.

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What are the best debugging practices for React Native apps?

1

2

3

4

5

6

7

1 Use the React Native Debugger

2 Enable Hot Reloading and Live Reloading

3 Use Console Logs and Alerts

4 Use Error Boundaries

5 Use a Testing Framework

6 Use a Crash Reporting Tool

7 Here’s what else to consider

Web Development

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What are the best debugging practices for React Native apps?

1

2

3

4

5

6

7

1 Use the React Native Debugger

2 Enable Hot Reloading and Live Reloading

3 Use Console Logs and Alerts

4 Use Error Boundaries

5 Use a Testing Framework

6 Use a Crash Reporting Tool

7 Here’s what else to consider

Web Development

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