使用 create-response-app 启动 npm 错误

It seems like you don't have react-scripts in your global environment. Two possibility are available here :

npm install -g react-scripts

or in your package.json change your script part like this :

  "scripts": {
"start": "./node_modules/react-scripts/bin/react-scripts.js start",
"start:prod": "pushstate-server build",
"build": "./node_modules/react-scripts/bin/react-scripts.js build",
"test": "./node_modules/react-scripts/bin/react-scripts.js test --env=jsdom",
"eject": "./node_modules/react-scripts/bin/react-scripts.js eject",
"server": "cd client/api && pm2 start server.js --watch",
"proxy": "http://128.199.139.144:3000"
},

Author of Create React App checking in.

You absolutely should not be installing react-scripts globally.
You also don't need ./node_modules/react-scripts/bin/ in package.json as this answer implies.

If you see this:

npm ERR! UpScore@0.6.0 start: `react-scripts start`
npm ERR! spawn ENOENT

It just means something went wrong when dependencies were installed the first time.

I suggest doing these three steps:

1. npm install -g npm@latest to update npm because it is sometimes buggy.
2. rm -rf node_modules to remove the existing modules.
3. npm install to re-install the project dependencies.

This should fix the problem.
If it doesn't, please file an issue with a link to your project and versions of Node and npm.

Yes you should not install react-scripts globally, it will not work.

I think i didn't use the --save when i first created the project (on another machine), so for me this fixed the problem :

npm install --save react react-dom react-scripts

it's possible that conflict with other library, delete node_modules and again npm install.

As Dan said correctly,

If you see this:

npm ERR! UpScore@0.6.0 start: `react-scripts start`
npm ERR! spawn ENOENT

It just means something went wrong when dependencies were installed the first time.

But I got something slightly different because running npm install -g npm@latest to update npm might sometimes leave you with this error:

npm ERR! code ETARGET
npm ERR! notarget No matching version found for npm@lates
npm ERR! notarget In most cases you or one of your dependencies are requesting
npm ERR! notarget a package version that doesn't exist.

so, instead of running npm install -g npm@latest, I suggest running the below steps:

 npm i -g npm //which will also update npm
rm -rf node_modules/ && npm cache clean // to remove the existing modules and clean the cache.
npm install //to re-install the project dependencies.

This should get you back on your feet.

For me it was simply that I hadn't added react-scripts to the project so:

npm i -S react-scripts

If this doesn't work, then rm node_modules as suggested by others

rm -r node_modules
npm i

incase you happened to be so unlucky like me that spent three(3) days in a row trying to solve this problem every solution proposed here failed me ... create a .env file in your project root and add this code SKIP_PREFLIGHT_CHECK=true. Good luck

This is to help others completely new to react and who area having problems just starting a first app even though they did a fresh install and try using npm install and the other fixes I saw around the forums.

Running it on Windows 10 with all the latest npm create-react-app installed and got failure after failure on a simple npm start in a simple my-app demo folder.

Spent a long time with what looks similar to the OP error at first but is slightly different. This starts with ERRNO 4058 and continues with code 'ENOENT' syscall: 'spawn cmd', path: ''cmd' ...

Eventually worked out from github create-react-app forum that a quick fix for this is registering cmd in the "path" variable. To do this go to System Properties>Environment variables. Click on path variable edit and and add new entry of C:\Windows\System32. Restart CMD prompt and I was good to go.

This occurs when the node_modules gets out of sync with package.json.

Run the following at the root and any sub service /sub-folder that might have node_modules folder within it.

rd node_modules /S /Q
npm install

I solve this issue by running following command

echo fs.inotify.max_user_watches=524288 | sudo tee -a /etc/sysctl.conf && sudo sysctl -p

hope it helps

It occurred to me but none of the above worked.

events.js:72
throw er; // Unhandled 'error' event
^


npm ERR! UpScore@0.6.0 start: `react-scripts start`
npm ERR! spawn ENOENT


Error: spawn ENOENT
at errnoException (child_process.js:1000:11)
at Process.ChildProcess._handle.onexit (child_process.js:791:34)

This happens because you might have installed react-scripts globally.

To make this work...

1. Go to your C:\Users\<USER>\AppData\Roaming
2. Delete npm and npm-cache directories... (don't worry you can install npm globally later)
3. Go back to your application directory and remove node_modules folder
4. Now enter npm install to install the dependencies (delete package-lock.json if its already created)
5. Now run npm install --save react react-dom react-scripts
6. Get it started with npm start

This should get you back on track... Happy Coding

My issue was stemming from permission issues. I solved mine by following this https://docs.npmjs.com/resolving-eacces-permissions-errors-when-installing-packages-globally

Add .env file with "SKIP_PREFLIGHT_CHECK=true" than npm start

I fix this using this following command:

npm install -g react-scripts

I have faced the following issue.

Please find the solution:

1. Add "C:\Windows\System32" to the global PATH environment variable.

2. Check whether the environment variables has been created for nodejs,npm and composer. if not create one

3. Run your app.

Type unset HOST in your terminal.

I had the same error when running

npm start

npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! protest-app@0.1.0 start: `react-scripts start`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the protest-app@0.1.0 start script.

I broke my head on several tabs and applying Solutions from other devs and nothing.

Until, even using Ubuntu, I closed my vscode and restarted my pc and all my problems were solved. (kkkk zueira) just this one.

it is simple but the first time it takes time a few steps to set !!!

1. you have the latest version on node.

2. go to the environment variable and set the path "%SystemRoot%\system32".

3. run cmd as administrator mode.

4. write command npm start.

I have created react project locally. This reason of occurring this problem (for me) was that I didn't use sudo before npm and it needs root access (

> sudo npm start

PS1: For windows users, the powershell or command line should be run as administrator)

PS2: If use want to solve the root access issue, you can see this post.

add environment variables in windows

1. C:\WINDOWS\System32
2. C:\Program Files\nodejs
3. C:\Program Files\nodejs\node_modules\npm\bin
4. C:\WINDOWS\System32\WindowsPowerShell\v1.0
5. C:\Users{your system name without curly braces}\AppData\Roaming\npm

these 5 are must in path.

and use the latest version of node.js

I might be very late to answer this question but this is what has worked for me and it might help someone to get back on the development track!

nvm install v12.0 // You may need to install nvm, if not already done
rm -rd node_modules/
npm cache clean --force
npm install

Cheers!!

i ran npm install inside the project then npm start it worked

just delete the "node_module" file and if its seems somehow grey in folder that means it's not there just close the vs code and re open then

install npm with "npm install".