Troubleshooting and Debugging React Native
console.logs for React Native
# run this command (when the app is running) to enable React Native logging # You only need to run this once and it'll be enabled for all future apps as well npx react-native log-ios npx react-native log-android
You can start
adb logging in another Terminal window
# For a steady stream of constant logging adb logcat # filter React related logs adb logcat '*:S ReactNative:V ReactNativeJS:V'
White screen of death
You get an empty blank screen and no errors..
Chances are you ran
react-native run-android first and then
What you gotta do is close the app. Run
react-native start and then in another terminal, run
react-native run-android. You have to run
react-native run-android in a separate terminal because you don't get the prompt back when running
Could not connect to development server 500 -OR- SHA-1 ReferenceError
The development server returned response error code: 500
error: ReferenceError: SHA-1 for file node/v12.18.0/lib/node_modules/react-native/node_modules/metro/src/lib/polyfills/require.js (node/v12.18.0/lib/node_modules/react-native/node_modules/metro/src/lib/polyfills/require.js) is not computed
Turns out i had
react-native insatlled globally instead of
react-native-cli. If you have both
react-native-cli installed, it'll be messed up..
Solution is simple
npm uninstall -g react-native npm i -g react-native-cli # OR yarn global remove react-native yarn global add react-native-cli
Or just use