React Native version mismatch

Question

Getting the following message when I init a new project and then launch the Xcode emulator      React-Native Version Mismatch      Javascript Version 0 50 1   Native version  0 50 0       Make sure you have rebuilt the native code        Does anyone know what is going on here and can help me

User · Answer

In my case  my android physical device does not connect to the js server running on my development machine  So i have to manually set the debug server host  amp  port on my android device

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The fix we did was to make sure the ANDROID HOME and PATH variables were set up prior to the build    First  run the below two commands then the build the app for the device   export ANDROID HOME  Users username MyFiles applications androidsdk export PATH  PATH  ANDROID HOME tools  ANDROID HOME platform-tools

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Try changing the version of your react-native specified in your package json  under dependencies - react-native  to the same as  Native Version  shown in the error message  Then run  npm install  again

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Just go to your android app build gradle and then add to the dependencies section   dependencies  compile   com facebook react react-native 0 50 3     force   true            the react native version can be found in package json

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Close the nodejs terminal and Rebuild

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I ve never seen this error before  but whenever I can t get Xcode and React-Native to play well together  I do a couple of things   Check what version of Xcode I m working with  If it needs to be updated  I update it   Then clearing watchman and the cache are the second place I go   I don t use the reset cache command   It always says that I need to verify the cache  so I skip that  you can do it though  I just get confused   I use rm -rf  TMPDIR react-  to get rid of any cached builds   If that doesn t work  I try to build the app in Xcode  then work my way from there  to build it with react-native run-ios   With this error message  it seems you might start by trying to build it with Xcode   Hope that helps   let me know your progress with it   Good luck   Also  you could update to RN 0 51 as another attempt to get your versions synced

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For my case I m facing it on iOS  and I ve tried to reset and clear all cache using below command but failed too  despite many comments saying that the root cause is there is react packager running somewhere accidentally  I ve restarted my mac and the problem still remained   watchman watch-del-all  amp  amp  rm -rf node modules   amp  amp  yarn cache clean  amp  amp  yarn install  amp  amp  yarn start --reset-cache   The solution is  to delete the build folder    ios build  then execute react-native run-ios solved it

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I was able to fix this by deleting node modules and running npm install again

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If you re running your React Native app through Expo  upgrading React Native is liable to cause this error  as noted at https   github com expo expo issues 923    If that s your scenario  your options are    Bump Expo  which is listed in your package json  to a version that is compatible with your React Native version  if one exists  which may not be the case - judging by the linked issue  I figure that Expo support trails React Native releases   Discard your changes  delete and reinstall your Node modules  Eject from Expo  and then  after checking that you can still run your app post-ejection  try your upgrade again

User · Answer

For me  who is running with a monorepo  there was a hidden react-native version inside yarn lock  It was not present in any package json  but was never deleted  I removed that particular react-native version from yarn lock  and did a yarn install  This cleaned out alot of old stuff and made sure that things was working fine

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I am using a physical device  in my case this solved the problem    Uninstall the app lsof -i  8081 kill -9 PID Rebuild the app  react-native run-android or react-native run-ios

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For others with the same problem on iOS with CocoaPods   I tried all of the solutions above  without luck  I have some packages with native dependencies in my project  and some of those needed pod modules being installed  The problem was that React was specified in my Podfile  but the React pod didn t automatically get upgraded by using react-native-git-upgrade   The fix is to upgrade all installed pods  by running cd ios  amp  amp  pod install

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In my case  I changed the expo version manually  I got the same issue because I forgot to update sdkVersion in app json and babel-preset-expo in package json  After that run  expo r -c to clear cache and start the app

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I have got the same issue while building my react native app for android and I did the following which worked for me    The  JavaScript version 0 50 1  in the error console is the react-native version in your package json file  Make sure it is the same version as  Native version 0 50 0  in the error console     I have Updated the react-native version to the  Native Version 0 50 0  as prompted in the error console  Rebuild the app react-native run-android

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This worked for me expo update 39 0 0 --npm As my expo version was 38 Check in package json

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Try installing the dependencies again  That worked for me-   1   yarn npm install 2   yarn npm start --reset-cache

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In your build gradle file add the following  implementation   com facebook react react-native 0 51 0         force   true      replace 0 51 0 with the version in your package json

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All those answers about changing versions to match whatever were wrong for me  What the error does not tell you is where that version is coming from  Running a search of all files  I found that there was only 1 place where the javascript version was defined  The problem was that the bundle   android app src main assets index android bundle  needed to be regenerated as it was containing older versions compared to the installed bundle  In order to regenerate that file  I had to run the following command  react-native bundle --platform android --entry-file index js --bundle-output android app src main assets index android bundle --assets-dest android app src main res  And because I had upgraded my react-native  running this command gave me a few errors I needed to resolve  mainly installing new dependencies   Clearing cache  reloading in android studio  reloading react  reloading the terminal  creating a new project and transfering the files  running watchman  all did not work as that specific bundle file happens to be tracked in the Git repo

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It happens sometimes when you try to run without closing the node server  in which the previous app was running  so try restarting React To do so  just run the following commands   1  To kill current processes killall node -9   2  To Start React  Native react-native start   3  Then Run android react-native run-android

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In my case  NOT using expo  amp  Android build   package json   dependencies          react    16 3 1        react-native    0 55 2      And app json        sdkVersion    27      resolved the issue

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This is what I ve done with it      Close all terminals and run build again    You may forget to close nodejs terminal from another project  and they happen to have installed different react version    So the code fetches from nodejs server conflicts with the native one

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For me it was due to react-native version in dependency section of package json file  It was    dependencies      expo     27 0 1    react    16 3 1    react-native     0 55 0      I chaged it to    dependencies      expo     27 0 1    react    16 3 1    react-native    0 52 0      Now it works fine

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This Answer is Published in 2020  Fix this Error in 3 steps   First step  I changed the value of expo in package json file to the latest supported version  according to expo documents visit here    Second step  I changed the value of sdkVersion in app json file to the same value of expo in package json   equal number to last step    Third step   I changed the value of react-native in package json file to the same value of React Native Version   according to expo documents visit here    now your ready to go   use npm install to install specified version of dependencies and then npm start to run the project

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I was trying to build and run a React Native app from WebStorm and ran into this problem  The simple solution for me was   watchman watch-del-all   On macOS  if watchman is not already installed  install it using Homebrew   brew install watchman

User · Answer

edit your package json for your javascript version  quot react-native quot    quot  0 50 1 quot    after run npm install

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This is not a fix  but in my case  I had multiple RN apps installed on my device and I was unknowingly attempting to  Reload  from within the wrong application   I m developing two apps simultaneously at the moment  So make sure you re in the correct application

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This would be especially applicable for Android Studio 3 2 or newer users  as this did not seem to happen before upgrading   If you didn t change the version of React Native in your configuration  package json  build gradle   the problem with the version mismatch could come from undetected changes to project files after checking out another commit in git  To overcome that  make sure to    Clean the build  Build  gt  Clean Project Sync Project with Gradle files  next to the Stop button on navigation bar Make Project  first button in navigation bar with an hammer icon And finally Run   Debug app   This would also overcome the Session  app   Error Installing APK error that might happen due to Instant Run once the app is uninstalled from the device

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I update the react-native version  0 57 4 to 0 59 8 and i getting the following message  React-Native Version Mismatch   This solution works for me   1 - In the folder of the project  update all the code react-native in the Android Studio   react-native bundle --platform android --dev false --entry-file index js --bundle-output android app src main assets index android bundle --assets-dest android app src main res   2 - Go to Android Studio and FILE- gt  gt INVALIDATE CACHES RESTART 3 - In Android Studio  BUILD- gt  gt CLEAN PROJECT 4 - In Android Studio  BUILD- gt  gt REBUILD PROJECT 5 - Delete App in simulator or Devices 6 - Run      I hope to help you

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I also had this issue using Expo and iOS Simulator  What worked for me was erasing the Simulator in Hardware  gt  Erase All Content and Settings

User · Answer

Opene projectdir android app build gradle  Try    compile  com facebook react react-native 0 51 0     force   true    Instead of compile  com facebook react react-native 0 51 0    force   true    Ref    Link

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Make sure also that the wifi is enabled in your emulator

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just force react native version in your android s app level gradle file  in the dependencies section   compile   com facebook react react-native 0 52 0     force   true     worked for me

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It means you forgot to close old one bundle  nodejs terminal  and that that terminal has another react native version  Option 1  - Close all terminal and restart again  Option 2  - react-native start --reset-cache Option 3  - killall node  Option 4  - Restart your system

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I have tried the solutions above but adding this to AndroidManifest xml seems to fix it     android usesCleartextTraffic  true

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Expo users - make sure your app json sdk version and package json expo version are  may be equal  compatible to each other

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I updated the SDK version in app json to match with the react native SDK version in package json to fix this issue  In app json   sdkVersion    37 0 0     In package json   react-native    https   github com expo react-native archive sdk-37 0 1 tar gz

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In case you created your react-native app using create-react-native-app  You should have a app json  expo   and a package json file  check if the expo versions match and change accordingly  For example in my case the problem was that in the app json file I had a 25 0 0 version for the expo sdkVersion attribute  I change that to 23 0 0 and everything worked   package json    dependencies          expo     23 0 4        react    16 0 0        react-native     0 50 4        app json        expo          sdkVersion    23 0 0     before was 25 0 0

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This is working for me    react-native start --reset-cache

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Possible Fix    Delete the package-lock json Run  watchman watch-del-all  amp  amp  rm -rf  TMPDIR react-   amp  amp  rm -rf  TMPDIR haste-map-react-native-packager-   amp  amp  rm -rf node modules  amp  amp  npm install   If the problem persists  try to execute the project directly from the Xcode  This worked for me

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For Android developers who couldn t get it fixed by just closing and rebuilding  Manually uninstall the app on the emulator device

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I had this problem for the longest time and none of the above solutions helped  I was in the middle of upgrading react native in a create-react-native-app project until I found out that not all versions of Expo support the latest React Native    Found this page linked in the documentation that shows which version combinations of React Native  React  and Expo are officially supported   Source  https   github com react-community create-react-native-app blob master VERSIONS md  Editing the app json and package json files to match the corresponding versions and running npm install got everything working again

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In my case installing a new virtual device helped  Now I am using 1 device per app

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I got this classing when TypeScript type definitions mismatched   E G react-native at 0 61 5 in dependencies and  types react-native at 0 60 0 in devDependencies    As soon as I updated devDependencies it worked  Didn t have to restart anything

[react-native] React Native version mismatch

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