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Error while using create react app command

Even though everything used to work couple of weeks ago, now I can not successfully create new react app with its templates.
When I try to run npx create-react-app my-app command, it only creates the folder with package.json, pckage-lock.json and node_modules. The public folder is missing and also, when I try to run npm start, it gives me an error saying:
npm ERR! missing script: start
npm ERR! A complete log of this run can be found in:
before it used to say happy hacking and the template page with react logo was displayed.
I tried to uninstall and install node again, clear cache but nothing helped. Any advice? Thank you so much!
My npm -v is 6.13.4 and node -v is v12.14.0

If you have installed create-react-app globally. remove that globally from you system
Try these steps
npm uninstall -g create-react-app
npx create-react-app app_name
cd app_name
npm start
Note- npx comes with npm 5.2+ and higher, see instructions for older
npm versions
Check this reactjs documentation.

Faced the same issue and fixed it by following the below steps:
Try to uninstall all existing global installation of create-react-app and check that they are removed properly by using the two commands below:
command for uninstalling: npm uninstall -g create-react-app
command for checking: which create-react-app
command for manual delete: rm -rf <path where create react app is located>
Once all the versions are removed, use: npx create-react-app <name_of_the_app>
For more details refer here

First, update the npm and node using following commands:
npm install -g npm
npm cache clean -f
npm install -g n
n stable
Remove globally installed create-react-app using:
npm uninstall -g create-react-app
Use npx for using create-react-app directly:
npx create-react-app <project-name>

I was having the same issue, and saw a lot of the same answers saying to uninstall create-react-app globally and reinstall using npx create-react-app my-app.
Downgrading my version of Node to 8.11.1 is what fixed it.
sudo npm install -g n
sudo n 8.11.1
node -v
> v8.11.1
After that I ran npx create-react-app my-app and it worked as expected.

nest Command not found

I followed the documentation to create my first NestJS project.
Installing the Nest CLI with the command npm i -g #nestjs/cli was successful.
The output was:
+ #nestjs/cli#6.3.0
updated 1 package in 11.326s
However, when I try to scaffold a project with the Nest CLI:
nest new project-name
I get the following error:
zsh: command not found: nest
Some details about my environment:
OSX
iTerm
npm version 6.5.0

Use npx #nestjs/cli instead of nest
e.g. npx #nestjs/cli g controller pages

I was also getting the same console error when npm installing!
Erro was
#nestjs/cli
npm WARN deprecated resolve-url#0.2.1: https://github.com/lydell/resolve-url#deprecated
npm WARN deprecated urix#0.1.0: Please see https://github.com/lydell/urix#deprecated
npm WARN deprecated chokidar#2.1.8: Chokidar 2 will break on node v14+. Upgrade to chokidar 3 with 15x less dependencies.
npm WARN deprecated fsevents#1.2.13: fsevents 1 will break on node v14+ and could be using insecure binaries. Upgrade to fsevents 2.
npm WARN checkPermissions Missing write access to /usr/local/lib/node_modules/#nestjs/cli
npm WARN checkPermissions Missing write access to /usr/local/lib/node_modules/#nestjs
npm WARN notsup Unsupported engine for watchpack-chokidar2#2.0.0: wanted: {"node":"<8.10.0"} (current: {"node":"12.14.1","npm":"6.13.4"})
npm WARN notsup Not compatible with your version of node/npm: watchpack-chokidar2#2.0.0
How I wasn able to install =>
Solution
sudo npm install -g #nestjs/cli

Following command works in my windows 10
node -v
v14.16.0
npm -v
6.14.11
npx #nestjs/cli new project-name

I was having the same issue, what I did was:
Installed the latest node with npm install npm#latest -g
and then added the following to my .bash_profile
alias nest="/usr/local/Cellar/node/11.9.0/bin/nest"
Tested with nest --version and it worked.
For some reason the path is not being called correctly, hope it helps.

Working through a NestJS/Mongo DB tutorial i stumbled into this very same problem. After trying all of the solutions that were listed above, even turning my default profile back to bash instead of using zsh, i found that simply adding the /usr/local/bin and ~/.npm-global/bin to my path variable resolved the issue. Hopefully this helps someone else who may stumble on this in the future as well.
export $PATH="/usr/local/bin"
export $PATH="~/.npm-global/bin"
Were the two commands i ran from iTerm2 in order to add them to my PATH environment variable. Once this was done a simple
env
showed the entries in my $PATH environment variable and the nest -v command worked without any issues.

I had same error when I use GitBash.
I resoved it:
If you use windows:
Your use CMD: npm i -g #nestjs/cli
Then you can use gitbash:
Check version nestjs: nest --version
Create app nestjs: nest new name_project

I have faced same problem and solved ,following this
write the command NPM root -g
check where NPM is installed
add it to your path environment variable

You have to add the following line to your ~/.zshrc file:
source $HOME/.bashrc
This is needed so that the npm binaries are available on startup.

After all the answers that I tried, I used my method
After installing npm i -g #nestjs/cli in my mac terminal.
open bash file in macos by typing open ~/.bash_profile in mac terminal. Like you can type it anywhere.
Your bash will look like this and use this line
alias nest="~/.npm-global/lib/node_modules/#nestjs/cli/bin/nest.js"
Restart your mac for changes to be reflected in your terminal.
There you go nestjs cli is now working globally 2nd screenshot.

I have just succeeded with
npx #nets/cli new project
when asked what manager to choose from npm / yarn / pnpm
made choice for pnpm
cd project
npm run start
Take care!

Must use sudo in comandline for linux, otherwise the command nest cannot be add to /usr/local/bin folder:
sudo npm install -g #nestjs/cli

You can try to use sudo
sudo yarn global add #nestjs/cli

I got the same issue.
I just uninstalled and reinstalled nextjs.
Finally, I can use next -v

Module not found (webpack)/hot/emitter #angular-devkit/build-angular after ionic serve - Ionic 4

Stack:
node v10.15.1
ionic 4.10.1
When I run ionic serve I get:
ERROR in (webpack)/hot/emitter.js [ng] Module not found: Error: Can't
resolve 'events' in
'/zazou/node_modules/#angular-devkit/build-angular/node_modules/webpack/hot'
Failed to compile.
Couldn't find an answer for this.
I tried to:
update #angular-devkit/build-angular
npm install webpack-hot-dev-clients
npm install -g webpack and npm install -g webpack-dev-server as suggested here
npm link wepack
I also tried to update my angular CLI
Similar question

Install events using npm.
npm install events
Or to save other people (e.g. repository users), run:
npm install events --save --dev

(same pb with angular 7, using angular/cli)
I don't have THE solution (as I don't really understand the issue), but after a lot of tries, it worked, so let me describe what I did, maybe it'll help you...
swicth to node 9.5.0 (used n to do it)
switching to npm 5.6.0
remove global webpackage (I installed it for a try to solve version..)
npm uninstall webpack -g
rm -rf node_modules
npm install
then an issue with rxjs-compat, so I installed the version 6.4.0 for rxjs and rxjs/compat
Then it worked...
Maybe executing one of these steps will help you...

I also encountered this (when updating to Angular 11). To fix I had to:
rm -rf node_modules
rm package-lock.json

'ng new my-app' error

I am trying to generate a new project and skeleton application using the latest version of Angular. I have tried uninstalling and reinstalling Angular CLI using:
C:\>npm install -g #angular/cli#latest
C:\>ng --version
#angular/cli: 1.4.5
node: 8.8.1
os: win32 x64
This error occurs when trying to run 'ng new my-app' in command prompt:
'Error: The command "new" has an option without the required type and name field'
Any help to resolve this issue is appreciated.

This is a known issue and there is an issue raised in github for this.
https://github.com/angular/angular-cli/issues/7984
Try below commands:
npm uninstall -g #angular/cli
npm cache clean
npm install -g #angular/cli#latest

After these steps:
npm uninstall -g #angular/cli
npm cache clean
npm install -g #angular/cli#latest
Do:
npm install #schematics/angular
And then:
ng new appname

npm: not found when setting up Jenkins Server?

This is my first time setting up a jenkins server. The build is using Amazon's EC2 and Ubuntu 14.04.
I've installed node and npm via nvm.
node -v
>v0.11.14
npm -v
>2.0.0
The repo pulls down just fine into my /var/lib/jenkins/workspace/morningharwood folder.
Problem: When I add my script it breaks
Here's my build script which errors out? I have no idea what i'm doing. I copied this from a tutorial.
QUESTION: How do I properly write my script to npm install, bower install and lastly, grunt test

You could install node, npm, bower and grunt by doing following:
sudo apt-get install node
sudo npm install bower
sudo npm install grunt
To install a package from local source, use
npm install /path

Try using NodeJS plugin for Jenkins: https://wiki.jenkins-ci.org/display/JENKINS/NodeJS+Plugin

This will solve npm command not found issue on jenkins even installed on server
sudo mkdir /usr/local/nvm
export NVM_DIR=/usr/local/nvm
curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.34.0/install.sh |NVM_DIR=/usr/local/nvm bash
. /usr/local/nvm/nvm.sh
nvm install 10.15.3 -g
npm install #angular/cli -g
Include following on build execute shell command in jenkins:
export PATH="$PATH:/usr/local/nvm/versions/node/v10.15.3/bin"
npm install