8 Ways to Debug your React Native App with Expo The Comprehensive Guide | by Abdulrahman Hashem | Medium 500 Apologies, but something went wrong on our end. When you run a project on your device with npx expo start or npx expo run:android, the Expo CLI automatically tells your device to forward localhost:19000 to your development machine, as long as your device is plugged in or emulator is running. The following are the debugging techniques generally used in React Native: Logging; Debugging in Chrome browser; Debugging in Visual Studio Code; Logging: It is a very quick and easy technique to debug your application in development phase. { Stepping through code with these buttons can take a while because, by default, it will take you through the Node modules folder and all the code that is executed there. Can I use my Coinbase address to receive bitcoin? To ensure the best debugging experience, first, change your host type to npx expo start --lan or npx expo start --localhost. To prevent this, you can add skipFiles to your debug configuration. Includes Apollo Client DevTools ( apollographql/apollo-client-devtools) as devtools extension. If you are experiencing any issues or want to learn more about how to use these tools, refer to this guide. I changed all 8081 to 8088. The debugger will receive a list of all project roots, separated by a space. Type in your machine's IP address and the port of the local dev server (e.g. There are a couple of ways to open Chrome DevTools the easiest one is to use the F12 keyboard shortcut on Windows and Linux and Fn + F12 on Mac computers. The breakpoint will then be listed in the Breakpoints section of the left panel. 10.0.1.123). Checks and balances in a 3 branch market economy. React Native doesn't play well with Chrome's source mapping in every case, so if you want to make sure you're breakpointing in the correct place, you should use the debugger call directly from your code. Thanks for reading. React errors can be grouped into one of the following four categories: React apps are rendered from reusable components, so the user interface doesnt always end up the way you expected. Making statements based on opinion; back them up with references or personal experience. That said, using Redux can be a pain if you cant debug your state, especially in React Native. That looks like a really bad idea. You have built a great app using React Native, and you are now itching to release it in the Play Store. Android: react-native run-android --port 8089 Change the server and port number in Dev-settings after launching the app on simulator or device. } Includes React Inspector from react-devtools-core. You must use the desktop app to debug React Native using React's Developer Tools. Lime Brains sp. If you choose Classic application, you will be asked to enter the address of the host, which will be auto-filled with localhost. https://medium.com/@hsuastegui/use-react-native-in-a-different-port-1109db5674d8, ./node_modules/react-native/scripts/launchPackager.command. Your app will reload whenever your JavaScript code has changed. Nice walkthrough. "8089", build iOS and Android package which listens to above port, iOS:. You can also click React Native Debugger (RND for Linux / Windows) -> Check for Updates in the application menu. 10.0.1.1:8081). The process will take a while, as it will create a counter . Start proactively monitoring your React Native apps try LogRocket for free. For instance, you could use VS Codes JavaScript debugger and React Developer Tools while developing your application and Raygun4JS for identifying and diagnosing React bugs and errors after deployment. Here is a permanent solution if you like. Make sure your laptop and your phone are on the same Wi-Fi network. You may also want to enable Pause On Caught Exceptions for a better debugging experience. You can treat these SSR React apps as Node.js applications and use Node.js debugging tools and best practices to resolve the arising issues. I also wanted to watch the noTabs variable, which determined which navigation stack would be used. To get started with React monitoring, sign up for a free 14-day Raygun trial to try Real User Monitoring and Application Performance Monitoring. This is important because your end users may still encounter issues that you didnt discover during the development phase. To check that your development environment is set up correctly, you can run the following command in your project folder: The next step is to install the React Native Tools extension in VS Code. lsusb should output something like this: These lines represent the USB devices currently connected to your machine. What sets React Native Debugger apart is that it combines a wide range of features into a single standalone app. You need to overwrite the RCT_METRO_PORT macro variable to ensure your app points to the correct port when running via xcode or react-native run-ios. (8081 by default). It will bring up an overlay that lets you tap on any UI element and see information about it: However, when react-devtools is running, Inspector will enter a collapsed mode, and instead use the DevTools as primary UI. From there, you can inspect the elements state, props, etc. In the debugger console, you can see the Element tree, as well as the props, state, and children of whatever element you select. In this section, you can dig through the call stack. And if you are not then, unreliable since the pod file header is recreated on each. You do that by setting a REACT_DEBUGGER environment variable. According to Expo docs you could enable React Native Debugger with a few extra steps and have access to its network tab but that didn't seem to work with Expo@v47.0.3 - I was never able to connect to React Native Debugger. Reactotron is an open-source desktop app that allows you to inspect Redux or MobX-State-Tree application state as well as view custom logs, run custom commands such as resetting state, store and restore state snapshots, and other helpful debugging features for React Native apps. I am able to change port number. In this tutorial, well show you how to use React Native Debugger to you guessed it debug React Native apps. Even though i run "react-native start --port 9988" and try to run the app by running "react-native run-ios" it tries to run from the default port of 8081 which is already occupied by McAfee. You can also iterate quickly on a device using the development server. What does "up to" mean in "is first up to launch"? This makes your UI testing much faster and accelerates the process of building your UI accordingly. Stephan is a full-stack web and mobile developer with over 16 years of experience. Following DevOps practices can also help you with setting up and maintaining a general development workflow that can prevent errors, therefore can reduce your debugging workload. To do so, click the Run and Debug button: Then, select the debugger application you want to use (to debug the example app, I chose the Web App Chrome option): VS Code will automatically add a launch.json file to the folder of your React application. Select your project in the Xcode Project Navigator, then select your main target (it should share the same name as your project). Based on project statistics from the GitHub repository for the npm package @react-native-windows/cli, we found that it has been starred 15,362 times. Clicking one run button is convenient, but it may not be worth the trouble of figuring out the errors preventing the app from launching when attaching to a running instance will work just as well. However, that's usually not the case. React Developer Tools is Facebooks open-source JavaScript library for React debugging. Next, it will ask you what platform you will create the debug configuration for. Just these steps will let you start RNDebugger out of box: Launch RNDebugger by typing the following command: The host / port means React Native packager. Follow . . This sets a breakpoint. Email [emailprotected]. your new title. Although clicking the play button in VS Code makes running and debugging your app simple and easy, run your project the standard way by attaching the debugger to the running app instead. If you right-click anywhere in the React Native Debugger, you'll get some handy short-cuts to reload your JS, enable/disable the element inspector, network inspector, and to log and clear your AsyncStorage content. **. This launch.json file will contain the debug configurations for our app. For debugging, whether its React or any other code, always open your browser in Incognito mode. Next, check the manufacturer code by using lsusb (on mac, you must first install lsusb). Now you'll see that your app is connected with the React Native Debugger tool: We're all set to begin using React Native Debugger. Its available as an extension to the Chrome, Firefox, and Edge browsers. React Native supports a few keyboard shortcuts in the iOS Simulator. Make sure that the dropdown in the top left corner of the Chrome console says debuggerWorker.js. This will open a new tab at http://localhost:8081/debugger-ui. To start debug mode, shake your mobile device or press Command + Shift + Z or Ctrl + M and choose the debug option. Thank you! I have extensive experience in designing and developing reusable UI components, conducting software testing (unit tests and end-to-end tests), optimizing performance, debugging and analyzing. You can find and download them right from the code editor by clicking the Extensions icon in the leftmost (vertical) menu. your website. Once the packager starts, VS code will show you a QR code, which you can scan with the Expo app installed on your phone, either for Android or iOS, to run and debug the app on your phone remotely. If your app is in debugging mode and. Go to your_app\node_modules\react-native\local-cli\server\server.js and change the port 8081 to 8088, UPDATE TESTED ON RN 0.57: // Fetch Tasks To create a high-quality React application, you cant skip over the debugging phase of your software development life cycle including everything from addressing error messages coming up in the development phase to monitoring live errors in production. Ill use the JavaScript Debugger extension by Microsoft as an example, which allows you to debug both client-side React applications in Chrome and server-side React applications running on a Node.js server: Once the JavaScript Debugger extension is installed in your code editor, you can open it by clicking the Run and Debug icon in the leftmost menu. In the main screen select Build Phases. This can apply both to requests sent to your own server and third-party assets such as embedded content or static files stored on a CDN (Content Delivery Network). You can view installation instructions in the README. You may encounter the need to monitor a request. You can launch your app either in Android or iOS with the standard commands you use. Import it like a component. To create a React project, run npm create-react-app counter-demo. When I developed native Android apps, I never had to set up debugging. To do this, you need to add the following code to your App.js. { It allows you to run console statements such as console.log(), console.warn(), and console.error(), just like when debugging native JavaScript code. @philk, Did you mean my solution isn't still acceptable?? density matrix. If you are using npx expo start --lan, make sure your device is on the same Wi-Fi network as your development machine. The JS thread is where most of your logic runs, including API calls, touch events, and so on. And below is the result. If you want to monitor mobile applications created with the React Native framework, you can use Rayguns React Native library instead of Raygun4JS. Or you might want to verify the response from the server. License: MIT . Choose Android as your target. . :0024 Intel Corp. Install the React Native Debugger Extension from the Visual Studio Code Marketplace. After spending a whole day and going through many solutions, a combination of the suggestions helped me resolve this. Here are some different ways to debug a react native application . React Native Debugger is a standalone debugger tool built using the Electron framework. React Native Debugger is a standalone debugger tool built using the Electron framework. You can see mine with a breakpoint I set below: Here, I put a breakpoint in a call to React Navigation because I wanted to ensure that a parameter was set correctly. Select Tools Developer Tools from the Chrome Menu to open the Developer Tools. Open your React Native app on your device. To Run the React Native App Open the terminal again and jump into your project using. If you're in doubt, try unplugging your phone and running the command again: You'll see that after removing the phone, the line which has the phone model ("Motorola PCS" in this case) disappeared from the list. On Android Studio you can do this by going on the "Run" option on the menu bar, clicking on "Attach to Process" and selecting the running React Native app. For example, you can use the Console tab to read the console.log statements. This is a standalone app for debugging React Native apps: Based on official Remote Debugger and provide more functionality. In the next and final question asking if you are using Hermes, choose yes. Now run react-devtools from the terminal to launch the standalone DevTools app: It should connect to your simulator within a few seconds. Or, you can add it to main function of Redux. There are several ways of accomplishing this, depending on whether you have access to a USB cable or a Wi-Fi network. Now, you can pause code execution by setting breakpoints from your code editor, use the debugging toolbar to step over or into functions, inspect the call stack, and more: You can also open Chrome DevTools to see that the code execution was, indeed, paused at the line where we added the breakpoint in Visual Studio Code: You may find that React debugging with Visual Studio Code is an improvement compared to Chrome DevTools because you dont have to move between the browser and code editor to change the code and you have access to IntelliSense, pre-set browser breakpoints, and other powerful features. This page lists a few tools to help debug your Expo project. However, the React Native debugger packs a lot more features than the remote one. For React debugging, the most important part of Chrome DevTools is the Sources tab because breakpoints allow you to pause code execution at any point so that you can examine what happens inside your code. Any idea how to resolve that? If you use npx expo start --tunnel with debugging enabled, you are likely to experience so much latency that your app is unusable. This document will guide you through the necessary steps to run your React Native app on a device and to get it ready for production. 34 0 1 0. gradle. If you dont, run the following command in the terminal to install it: Now, choose the Expo host parameter you want to use. Run with --scan to get full insights. You can find the IP address in System Preferences Network. However, with thorough testing, including regression testing and continuous monitoring, you can prevent new features from causing regressions in existing behavior. Frames Per Second for the UI and JS threads. These bugs are harder to detect, as they arent visible on the screen like UI errors, dont always result in a crash, and dont always throw an error message. It uses @react-native-community/cli-debugger-ui: Opens up a small window giving you performance information about your app. How a top-ranked engineering school reimagined CS curriculum (Ep. rev2023.4.21.43403. So, I added this variable to the Watchsection. Open up VS Code and your React Native project and search the extensions for React Native Tools. Make sure you see the Microsoft name on the extension. github.com/nikhil-thakkar/react-native-patch, https://facebook.github.io/metro/docs/en/configuration, https://medium.com/@hsuastegui/use-react-native-in-a-different-port-1109db5674d8. Making apps in React Native can be really exciting, but the process of debugging an app can be really frustrating, depending on the platform, the tools on your computer, the available ports, the type of build, etc. react-native run-android --port=1234. So what happens when you cant get past the first step. Go to Dev Settings Debug server host & port for device. Now, lets see how to inspect and debug a React application using these two tools. To get correct line numbers open up the Chrome Dev Tools settings, go to the "Blackboxing" tab, make sure that "Blackbox content scripts" is checked, and add .css-132u7c9{font-weight:400;font-size:1rem;line-height:1.625;letter-spacing:-0.011rem;color:var(--expo-theme-text-default);font-weight:600;}expo/build/logs/RemoteConsole.js as a pattern with "Blackbox" selected. Save the file, and VS Code will add a Launch Chrome button to your debugger panel on the left. If you are running on the device, check if you have the right IP address in RCTWebSocketExecutor.m. RNDebugger will try connect to debugger proxy, use port 8081 by default, you can create a new debugger window (macOS: Command+T, Linux/Windows: Ctrl+T) to specify the port if you want. TypeError: Reduce of empty array with no initial value, Not sure if this article (for expo users) still up-to-date. Next, youll be asked how you want to debug the application. Becoming familiar with it will help you level up your debugging skills, especially if you have only used console.log up to this point. Another option is to run your application using the React Native CLI and attach the native debugger of the native IDE (Android Studio or Xcode) to the process. You will see Run Script. react-native android genymotion error java.util.concurrent.ExecutionException: Update a react-native applications to load the JavaScript bundle from a server running on a non-standard (8081) port. LogRocket also helps you increase conversion rates and product usage by showing you exactly how users are interacting with your app. **. "request": "launch", Plus, when running in the managed workflow, you can configure sourcemaps so that the stracktraces you see in Sentry will look much more like the code in your editor. To use this, you can start an external packager (from command line i.e) and attach the debugger to that packager port. To debug React Native apps in VSCode, we have to install React Native Tools extension in VSCode.. To setup debugging, go to debug panel -> create a launch.json file -> From the menu, select React Native.. Could a subterranean river or aquifer generate enough continuous momentum to power a waterwheel for the purpose of producing electricity? [Become a backer], Support this project by becoming a sponsor. The UI thread is used for native Android or iOS UI rendering. If you're using Create React Native App or Expo CLI, console logs already appear in the same terminal output as the bundler. C# C++ Modifying your C# RNW app It also has five buttons on it that do these things: I only use the pause and stop buttons. Run the redux example of react-navigation with Redux DevTools setup. If you choose Tunnel, youll be asked to create an Expo account username and password if you havent done so already. As soon as you select it, it will be available as $r in the Chrome console, letting you inspect its props, state, and instance properties. How to use RCT_METRO_PORT correctly to change metro bundle port? This is not the correct answer. This disables your browser extensions so that they wont affect debugging (some of them add elements or functionality to the web pages you load). There is also the option to check caught and uncaught expressions to break on every one of those types of exceptions, which is useful when you want to track down why an app is crashing. Go to "Signing" and make sure your Apple developer account or team is selected under the Team dropdown. Hint: You can also use the React Native CLI to generate and run a Release build (e.g. The Profiler tab doesnt support production builds. The value for REACT_DEBUGGER is whatever command you want to run. When trying to connect to the development server you might get a red screen with an error saying: Connection to http://localhost:8081/debugger-proxy?role=client timed out. Here are some resources you may find useful: The official API reference guide at React.dev, Viduni Wickramarachchis tutorial at Bits and Pieces, JeB Barabanovs tutorial on his website. While debugging, it can help to have Fast Refresh enabled. You have built a great app using React Native, and you are now itching to release it in the App Store. The second method would be to . This is what our example task tracker application looks like in Chrome DevTools: While Chrome DevTools doesnt have a React debugging tool by default, you can use its powerful JavaScript debugger to debug React errors. Or, if youre on macOS, you can run this command in your terminal: After downloading and installing the package, you can start using React Native Debugger. If everything is set up correctly, your device will be listed as the build target in the Xcode toolbar, and it will also appear in the Devices pane (2). For macOS, you can use Homebrew Cask to install: This puts React Native Debugger.app in your /applications/ folder. This is simple , but painful to code all of these debug statements. In react-native-debugger-open, it can be sent the host / port setting if RNDebugger opened, but can't automatically open if closed. To fix this, choose Exponent in the platform options instead of Android or iOS. The answer just to show everyone that someone uses vim. Navigate to the ios folder in your project, then open the .xcodeproj file, or if you are using CocoaPods open .xcworkspace, within it using Xcode. Lets launch the debugger tool. npm install --save redux-devtools-extension or yarn add redux-devtools-extension Installation To use the Redux dev tool, you need to activate Redux in your app. In Android, direct mode can only be used with Hermes. This is a standalone app for debugging React Native apps: To install the app, you can download a prebuilt binary from the release page. They are described below. "url": "http://localhost:3000", To connect your app with React Native Debugger, you need to run your app and start debug mode. You'll need to input this into your udev rules in order to get up and running: Make sure that you replace 22b8 with the identifier you get in the above command. . Why in the Sierpiski Triangle is this set being used as the example for the OSC and not a more "natural"? Common constraints include CPU . You may also access the DevTools using keyboard shortcuts (I on macOS, Ctrl Shift I on Windows). react-native run-ios --port=1234, For Android Once the first menu comes up, select Attach to application. Linux and Windows will show a dialog of new versions available for download. I have yet to find a place where it wont eventually be in the way, though. Lime Brains. Refer to the Expo guide for running your project on your device for more information. Choose one and click play to run the configuration. Look for the "General" tab. Xcode will then register your device for development. [Become a sponsor]. There is a search box at the top that helps you find one by name. It provides: The React Native Debugger includes many tools listed later on this page, all bundled into one, including React DevTools and network request inspection. Use the following command to change the port that react native uses: To use this app you need to ensure you are using the correct version of React Native Debugger and react-native: We used different auto-update feed for v0.10 and v0.11, so you won't see update tips of v0.11 from v0.10. The standalone app based on official debugger of React Native, and includes React Inspector / Redux DevTools. You can use Redux time travel to debug your state over the time. So your solution does not work reliable. If you want to use them to debug the production build, here are some things to know: The Components tab does show your components in production mode, but their names are abstracted away (for example, in our example app, the Header component appears as x). This is useful when there's a noisy warning that cannot be fixed, like those in a third-party dependency. Follow the steps given below: Create the project using the command: Please correct this by running adb shell "date `date +%m%d%H%M%Y.%S%3N`" on your debugger machine. Are you running node proxy? LogRocket also helps you increase conversion rates and product usage by showing you exactly how users are interacting with your app. If you have any issues, ensure that your Mac and device are on the same network and can reach each other. If connecting to the emulator proves troublesome (especially Android 12), try running adb reverse tcp:8097 tcp:8097 in a new terminal. it was really helpful for me to setup debugging for react native. You can easily integrate this debugger tool along with the Chrome Dev tool. Click open the Debugger, +t to open new window and set port to 19001. npm start expo app, open Developer menu, enable "Debug JS. You only have to be on the same Wi-Fi network as your computer. If you are not using Hermes, choose Classic application. Redux is one of the leading state management libraries available. why developers like RN folks hardcoded the most important thing. Got the point? use console.log ("debug message") . If so, you may get a couple of error codes and nothing will run. This debugger tool is based on the remote debugger which is included in React Native out of the box. The examples were bootstrapped with create-react-native-app. The Developer Menu is disabled in release (production) builds. You can install React Native Debugger from GitHub. For instance, in our example app, you might want to see what happens inside your code right before the tasks are fetched from the database. To view a console error or warnings, tap the notification to view the full screen information about the log and to paginate through all of the logs in the console. If you haven't started your debug-tutorial application. Alternatively, you can refer to our environment setup guide to learn how to build your app using Expo CLI, which will allow you to run your app using the Expo client app. I love to explore new technologies and update my skills. Not sure if this is documented or not[1], you can specify the port via a CLI argument, like this: I found it in the source code, and it worked on my local machine :), https://github.com/facebook/react-native/blob/master/local-cli/server/server.js#L30, [1] This is now documented here: https://facebook.github.io/react-native/docs/troubleshooting#using-a-port-other-than-8081. React Native Debugger is the holy grail of debugging React Native applications as it combines Chrome Devtools, React Devtools, and Redux Devtools all in one window.

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