Develop Reference

Error: Unable to resolve module 'XXXXX' could not be found within the project

I'm keep getting this error whenever I try to install any npm package on my windows 10 for android. It shows the package added in android studio and node_modules as well. However when i import the npm package in JS file and run the project the error comes up. With the below instructions :
If you are sure the module exists, try these steps:
Clear watchman watches: watchman watch-del-all
Delete node_modules: rm -rf node_modules and run yarn install
Reset Metro's cache: yarn start --reset-cache
Remove the cache: rm -rf /tmp/metro-*
Does anyone knows what i'm doing wrong? I'm using react-native 0.63.2

It means the metro bundler does not know there is a new package installed. In that case, turn off the metro bundler and follow the steps you listed above and then npx react-native run-android. Those steps clear the cache and help metro find the new package that was installed.

Check in any of the files you were working on recently and be sure you are not mistakenly importing XXXXX somewhere, in my case it was process as shown in the image above. Most times it happens when you invoke a function or method within your module

Version Mismatch in React-Native Version 0.60.3

"react": "16.8.6",
"react-native": "0.60.3"
React Native Version mismatch error after run new vesion app

I have 2 RN projects. And when I use reactotron app with the first project (RN 0.59) and open a new one without stopping reactotron then this error happens. Restarting reactotron helped me.

react-native 0.60.0 new version
use the command
react-native start
or
npm start
or
react-native run-android

Use this :
First of all uninstall app from your device
After this clean gradlew
close the Metro bundler and also terminal
Open terminal in the root of your project directory and run
npm start -- --reset-cache
or
yarn start -- --reset-cache
Open another terminal in the root of your project directory and run
react-native run-android
OR
Restart the system
Hope it will work

ReactNative build for android just freezes over the last step

I was developing a React Native project as always; when I encountered the following error after doing react-native run android or equivalently cd android && ./gradlew installDebug.
It's just over the last step that this exception is caught:`
:app:assembleDebug
:app:installDebug
Exception in thread "Device List Monitor" java.lang.NullPointerException
at com.android.ddmlib.EmulatorConsole.checkConnection(EmulatorConsole.java:317)
at com.android.ddmlib.EmulatorConsole.getConsole(EmulatorConsole.java:231)
at com.android.ddmlib.DeviceMonitor.queryAvdName(DeviceMonitor.java:248)
at com.android.ddmlib.DeviceMonitor.updateDevices(DeviceMonitor.java:220)
at com.android.ddmlib.DeviceMonitor.access$400(DeviceMonitor.java:65)
at com.android.ddmlib.DeviceMonitor$DeviceListUpdateListener.deviceListUpdate(DeviceMonitor.java:662)
at com.android.ddmlib.DeviceMonitor$DeviceListMonitorTask.processIncomingDeviceData(DeviceMonitor.java:847)
at com.android.ddmlib.DeviceMonitor$DeviceListMonitorTask.run(DeviceMonitor.java:781)
at java.lang.Thread.run(Thread.java:745)
> Building 97% > :app:installDebug`
I'm coding on react-native version 0.43.2 and react-native-cli 2.0.1, also npm 4.1.2 and yarn 0.21.3; Ubuntu 16.04. So everything is armed to teeth by the latest version but I still can't figure out the problem. It happens even for a project I just create by react-native init, it's every where. :(
P.S. be sure my emulator is up and running and the problem isn't due to it.

Try restarting adb in to make it probe the local 5554 port
killall adb; adb devices

Actually, I never found the reason or the solution to the problem. But what I know, I went on with my daily work, and after a day or two (with a couple of restarts in this period) it began working again. And till now, I haven't encountered the problem again.

try to specify the path for sdk/build-tools in the terminal
export PATH="Users/YOURUSERNAME/Library/Android/sdk/build-tools/...":$PATH
after that restart the emulator and try
npm run android

The fix I have found that works for me is to:
Close the emulated device so you have nothing listed when running adb devices
Run react-native run-android so the build fails correctly with a No connected devices! error
Restart the emulator and run react-native run-android again
Unfortunately I still have to run this after every restart, would love to get to the root cause and fix it once and for all!

If you had hit the following error while installing watchman, you will most likely hit the issue mentioned in this discussion
Warning: The post-install step did not complete successfully
If this is the case, check what the watchman window shows. If it is something like this:
Watchman: watchman --no-pretty get-sockname returned with exit code=1, signal=null, stderr= 2018-08-24T17:37:44,142: [0x7fffab20d380] while computing sockname: failed to create /usr/local/var/run/watchman/macbookpro-state: No such file or directory
Do
> brew uninstall watchman
> cd /usr/local/var/
> sudo chown -R $(whoami) var
> brew update
> brew install watchman
Kill/close the emulator device and run the command
> react-native run-android
You should see the action fail with message like
> com.android.builder.testing.api.DeviceException: No connected devices!
Now, rerun the command to see the compilation successful and the app opening up in the emulator
> react-native run-android

react-native run-android is unrecognized

I've installed react-native-cli globally:
npm install -g react-native-cli
Then run:
react-native init AwesomeProject
cd AwesomeProject
I got the following structure:
-- AwesomeProject
---- node_modules
------ react-native
When I run react-native run-android I get an error:
Command run-android unrecognized. Did you mean to run this inside a react-native project?
When I run react-native start I get the same.
react-native -v
prints:
react-native-cli: 0.2.0
react-native: n/a - not inside a React Native project directory
What I'm doing wrong?

the answer is easy nad it is not because of any bug at all.
make sure you are in correct directory
if in current directory there is not any react native app ,it gives you this error

What caused this for me was running npm install --save [package] when actually the system has previously been using yarn instead of npm.
To solve this I just deleted the node_modules folder and ran: yarn install and after that react-native run-ios (or android) works fine.
(This is a duplicate of React Native: Command `run-ios` unrecognized)

I just ran "yarn" with no arguments and it fixed it.

Please try this command:
npm install --save react-native

The problem was that I terminated init command because it looked like hanged without errors (even 24 hours later). To fix this I updated nodejs and npm to newer versions. Once I have done it react-native init was executed properly and there is no more problem with react-native run-android.

react-native run-android is unrecognized
Make sure that you have installed npm or use
in your project directory
npm install

you have to update your npm.
To do that
npm install npm#latest -g

try "yarn install".
It will install the missing files in node_modules
It worked for me

This can be caused by a couple of issues.
!!! Before trying each solution remember to open a new terminal since you might have old paths sources from your .bashrc file. !!!
You did not install the contents of the project. In order to solve this you have to install the node_modules by typing:
npm install or yarn install
You are coming back to a previously installed project after doing some funny things with your react-native installation and global configurations. (Upgrading the library, upgrading node doing something with globally installed node_modules).
You should clean all your caches and project modules
Here you can find a command to do all these things in one line (remember to replace npm with yarn accordingly):
https://gist.github.com/jarretmoses/c2e4786fd342b3444f3bc6beff32098d
Your global installation of react-native or react-native-cli is broken. In this case simply reinstall your libraries globally.
npm: npm install -g react-native && npm install -g #react-native-community/cli
yarn: yarn global add react-native && yarn global add #react-native-community/cli

I think the command you are looking for is react-native run-android.
cd into your project and run this command where all you js files are present and not in the android folder.
It will run a package manager, do not close that. Also you need to have an emulator or a device connected to your computer with usb debugging enabled.
Hope the answer helped

npx react-native run-android
Use of npx will pick local npm node_modules directory

Do npm install then run react-native run-android

Make sure you go into the directory having package.json
If you have deleted nodemodules try "npm install".
And don't forget the "init" in "react-native init MyApp". "init"
initializes the package.json.

Step 01 : Make sure that you are in right directory
Step 02 : npm install run this command
Step 03 : npm audit fix run this to fix issues
Try deleting node_modules folder and then run the commands again

You can solve this by yarn or npx:
yarn react-native run-android
npx react-native run-android

Everything has already tried like me? Then try again once "Yarn install after deleting node_modules". It worked for me.

I did everything correct while setting up, but was unable to run the android code. Just make sure while running the command react-native run-android that, you are inside the AwesomeProject folder created by the react-native init AwesomeProject command.
The folder by default for my PC was under C:\Windows\system32\AwesomeProject in Windows.
Hope it helped for the first timers :)

You need to update the project with the latest version of react-native. Just run this command.
npm install --save react-native#latest

If you guys have latest react native version and facing this error
"UNRECOGNIZED COMMAND run-android".
then run follow these steps it will definitely help you.
Step: 1 -> create a new file "react-native.config.js" in the project root directory.
Step : 2 -> Inside "package.json" you have "assets" array inside "rnpm" object cut these assets from this and paste in your "react-native.config.js".
i-e:
module.exports = {
assets: ['./assets/fonts'],
}
Step : 3 -> Remove "rnpm" object from "package.json".
Step : 4 -> Replace your "scripts" with below mentioned "scripts" inside "package.json"
"scripts": {
"start": "node node_modules/react-native/local-cli/cli.js start",
"test": "jest",
"android": "react-native run-android",
"ios": "react-native run-ios",
"lint": "eslint .",
"android:prod": "npx react-native run-android --variant=release",
"ios:prod": "react-native run-ios --configuration Release"
}
That's it
Happy Hacking..............

Uninstall react-native from global
$ npm uninstall -g react-native
Then
Install react-native to global
$ npm install -g react-native-cli

That worked for me
react-native run-android
start [options] starts the webserver
run-ios [options] builds your app and starts it on iOS simulator
run-android [options] builds your app and starts it on a connected Android emulator or device
new-library [options] generates a native library bridge
bundle [options] builds the javascript bundle for offline use
unbundle [options] builds javascript as "unbundle" for offline use
eject [options] Re-create the iOS and Android folders and native code
link [options] [packageName] links all native dependencies (updates native build files)
unlink [options] <packageName> unlink native dependency
install [options] <packageName> install and link native dependencies
uninstall [options] <packageName> uninstall and unlink native dependencies
upgrade [options] upgrade your app's template files to the latest version; run this after updating the react-native version in your package.json and running npm install
log-android [options] starts adb logcat
log-ios [options] starts iOS device syslog tail
dependencies [options] lists dependencies
info [options] Get relevant version info about OS, toolchain and libraries
They have made some unnoticeable changes. For instance run-android(now) run android(before).

Try to delete "package-lock.json" and re-run "npm install", then try your command, It should work

I got this error because I had parenthesis in the path "(" and ")". Possibly this error is thrown for other special characters as well.

Ensure you run the command in the projects' terminal, preferably the Android IDE. Run the adb devices to know your active devices as well

If your package.json file is containing any comment then this error is comes. So remove all comments from package.json and then run command it will work.
Also try to run command npm install --save then it will log if other error there. If any others error also there, then first fix it and then run command it will work.

In Android Studio click in Tools -> SDK Manager -> in System Settings click in Android SDK -> choose tab SDK Tools, then enable Android SDK command line tools (lasted).
It work for me!

Open your React Native Project Root Directory and locate android -> app -> build -> intermediates -> signing_config -> debug -> out -> signing-config.json
Delete signing-config.json file
And rebuild your application.
react-native run-android

First thing you need to delete node_mouldes and package.lock.json and do yarn install after that if you're using Windows OS you need to use PowerShell not git bash and write this command "react-native run-android"

Install npm again to latest
react-native init project_name
cd project_name
open android studio the same android folder inside your project_name
react_native run_android
will work now

for the last time your project was working fine and now you got this error suddenly and you have Node modules already installed then just trynpm install --save react-native
this work for me

react-native: command not found

I am getting -bash: react-native: command not found error while creating a react-native project.
Below are the additional info
1. brew --version
homebrew 0.9.9
2 brew info watchman
watchman `enter code here`stable 4.50
/usr/local/Cellar/watchman/4.4.0
3. brew info flow
stable 0.24.1
/usr/local/Cellar/flow/0.24.1
4. brew info node
stable 6.1.0
/usr/local/Cellar/node/6.1.0
5. npm -version
3.8.6
6. echo $PATH
/Users/Ashok/.rbenv/shims:/Users/Ashok/.rbenv/shims:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin
I tried the suggested steps from this link but I am still getting the same error.
I don't have any "npm" directory which they have specified in the solution
Ashoks-MacBook-Pro:share Ashok$ ls
aclocal doc info ruby-build zsh
autoconf emacs man systemtap
But I found npm file exists in the below location.
/usr/local/Cellar/node/6.1.0/etc/bash_completion.d
I uninstalled react-native and installed it again but I am still facing the same issue.

After adding right path to the PATH variable issue is resolved.
Below are the steps to find the right path.
1. Enter: npm install -g react-native-cli
output: /usr/local/Cellar/node/6.1.0/libexec/npm/bin/react-native ->/usr/local/Cellar/node/6.1.0/libexec/npm/lib/node_modules/react-native-cli/index.js/usr/local/Cellar/node/6.1.0/libexec/npm/lib
└── react-native-cli#0.2.0
from above output you can clearly see the path: /usr/local/Cellar/node/6.1.0/libexec/npm/bin/react-native
export PATH="/usr/local/Cellar/node/6.1.0/libexec/npm/bin:$PATH"
react-native init appName
cd appName
react-native run-ios
if you getting xcrun: error: unable to find utility "simctl" at this stage you can reslove using below steps
XCode -> Preferences -> Locations -> Command Line Tools -> Choose Xcode 7.2.1
You can find original solution from xcrun unable to find simctl
Thanks to #fbozo
That's It!!!

run this code
npm i -g react-native-cli
close your cmd and open it again

After continually running into this problem, and hitting this answer and not having it work..
Assuming you don't run npm as root/sudo (which you shouldn't do!) your npm modules will be installed in whatever you set your default directory to be.
Assuming you have followed those instructions, and your default directory is ~/.npm-global, then you need to add ~/.npm-global/bin to your path.
This is outlined in those instructions, but for me I added this to .bashrc:
export PATH=$PATH:$HOME/.npm-global/bin
Then restart your shell and it will work.

Try
npx react-native
if doesn't work install globally
npm i -g react-native-cli

If who have error , try it with sudo:
sudo npm install -g react-native-cli

If you're using yarn, you may have to run commands with yarn in front. Example:
yarn react-native info

I ran into this issue by being a bit silly. I use nvm to manage my different versions of node, and installed react-native into a version of node that was not my default. Upon opening a new shell, I lost my command. :) Switching back of course fixed things.

If for some strange reasons, the path to react-native is not in the PATH, you should take note where the react-native executable is installed. Generally, the issue with command not found is because they are not in PATH.
For example, I use nodenv and run npm install -g react-native
/Users/khoa/.nodenv/versions/10.10.0/bin/react-native -> /Users/khoa/.nodenv/versions/10.10.0/lib/node_modules/react-native/local-cli/wrong-react-native.js
So I need to add that to my PATH
export PATH=$HOME/.nodenv/versions/10.10.0/bin:$PATH
You can verify with echo $PATH
Or you can use npx to execute local npm modules, for example
npx react-native run-ios --simulator='iPhone X'

Install react-native globally by using the following command
npm i -g react-native-cli

Had the same issue but half of your approach didn't work for me .
i took the path the way you did :from the output of react-native-cli instal but then manually wrote in ect/pathes with:
sudo nano /etc/paths
at the end i've added the path from output then ctrl x and y to save .
Only this way worked but big thanks for the clue!

Install react-native-cli with npm install -g react-native-cli.
You may need to use sudo like sudo npm install -g react-native-cli

At first run this command on your terminal.
npm i -g react-native-cli
Then create your react-native project by this command.
React-native init Project name
then move to your project directory by cd command.

According to official documentation, the following command worked for me.
npx react-native run-android
Link is here
https://facebook.github.io/react-native/docs/getting-started
I was trying to run by "react-native run-android" command. make sure to have react-native cli installed globally!

In case anyone has this problem, I had a similar problem to qix, but more nuanced.
New shell terminals would default to a different version of node.
I would change my terminal to the node I wanted, but when the bundle script run, it ran in a new shell, and it got the default version which did not have react-native installed.
I used nvm alias default x.x.x so that new shells would inherit the default version I wanted.

/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
brew install yarn
brew install node
brew install watchman
brew tap AdoptOpenJDK/openjdk
brew cask install adoptopenjdk8
npm install -g react-native-cli

Dears,
Please try : npm install -g react-native-cli
If you get an error like Cannot find module ‘npmlog’ you can install npm directly using this command. If the above command run successfully then no need to run this command
curl -0 -L https://npmjs.org/install.sh | sudo sh
#For_Ubuntu.
Best regards.

In cmd Administration mode,Run
npm install react-native-cli

This is really weird, on my side (macOS 10.14), i'm pretty sure my node and npm work but i kept getting command not found only for this particular package. I ended up doing the following:
Install react-native-debugger
Make sure you enabled remote JS debugging, docs
Run react-native-debugger
Run your RN app
You can now debug view hierarchy and see console logs in react-native-debugger

I already had react-native and react-native-cli installed and just had to run:
yarn install

I had this issue after ejecting from expo and forgot to delete the node_modules and reinstall by running yarn or npm install.
After I did that then run npx react-native run-android, it worked fine!

try using react-native --help and see what comes up. try curl
react native library recommendation:
If you get an error like Cannot find module 'npmlog', try installing npm directly: curl -0 -L https://npmjs.org/install.sh | sudo sh.
https://facebook.github.io/react-native/docs/getting-started.html

I did an npm update, runned into the same error but after do an npm install and re-build the app worked!