错误：纱线启动 - 错误命令“start”未找到

Question

I am trying to learn React and I am using a private repo to start with it.

I run yarn start in the directory of the repo but I get the error message:

yarn run v1.13.0
error Command "start" not found.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

I have both node and yarn installed.

For node:

v10.15.0
node is /usr/local/bin/node

For yarn:

1.13.0
yarn is /usr/local/bin/yarn

I tried to reinstall both node and yarn but I get the same error message. moreover I tried to remove the yarn chance via yarn cache clean but nothing seems to work.

The package.json contains the following:

{
  "name": "02-Manipulating-Strings",
  "version": "1.0.0",
  "author": "ssaunier",
  "license": "UNLICENSED",
  "private": true,
  "devDependencies": {
    "eslint": "^4.7.2",
    "eslint-config-airbnb-base": "^12.0.0",
    "eslint-plugin-import": "^2.7.0",
    "jest": "^21.1.0"
  },
  "scripts": {
    "test": "(eslint lib || true) && jest"
  }
}

The directory is organised in the following way:

Answer 1

There is no start command inside the scripts of the package.json file.

"scripts": {
  "start": "some command to be run", // you need to add this line
  "test": "(eslint lib || true) && jest"
}

Maybe you want to run the test command instead - npm test / yarn test ?

Answer 2

Solved it thanks to the insight of the user: Tsvetan Ganev.

I was trying to run a command that it is not in my scripts. Specifically, yarn start is not in the scripts part of the file package.json . To solve the issue I added the following line in scripts

"start": "webpack-dev-server --mode development",

Answer 3

赶紧跑

yarn add react-scripts

Answer 4

您也可以尝试先运行npm install然后npm run或先npm run yarn然后npm run yarn start

Answer 5

I had the same issue start command not found. I followed below instruction to recreate react app

. Go to your parent folder in cmd
. Type yarn add create-react-app
. And yarn create-react-app FolderName

After installing yarn start will work.

Answer 6

I had this problem. I figured the best way is this.

1. npm i -g create-react-app
2. create-react-app my-react-app //or whatever you want your project to be
3. cd my-react-app
4. yarn start

Answer 7

I got the same error message "start" command not found. My issue got resolved by following the below mentioned steps.

-open the folder in which you want to create the app using terminal then type these commands:

1. npm uninstall -g create-react-app
2. npx create-react-app FolderName

(This will automatically install the latest create-react-app version)

-Then run the command yarn start and it will work.

Answer 8

Adding this to package.json worked for me

  "scripts": {
    "start": "expo start",
    "android": "expo start --android",
    "ios": "expo start --ios",
    "web": "expo start --web",
    "eject": "expo eject"
  },"devDependencies": {
    "babel-preset-expo": "^7.0.0"
  },

Answer 9

If you are using create-react-app and encountered this error, chances are you did not install create-react-app successfully.

Try removing globally installed create-create-app as explained below.

Template not provided using create-react-app

Answer 10

check your package.json that has "start" scripts. if you just have dependency list, make sure you have the following on the package.jons

"devDependencies": {
    "@theia/cli": "next"
  },
  "scripts": {
    "prepare": "yarn run clean && yarn build && yarn run download:plugins",
    "clean": "theia clean",
    "build": "theia build --mode development",
    "start": "theia start --plugins=local-dir:plugins",
    "download:plugins": "theia download:plugins"
  },
  "theiaPluginsDir": "plugins",
  "theiaPlugins": {
    "vscode-builtin-css": "https://github.com/theia-ide/vscode-builtin-extensions/releases/download/v1.39.1-prel/css-1.39.1-prel.vsix",
    "vscode-builtin-html": "https://github.com/theia-ide/vscode-builtin-extensions/releases/download/v1.39.1-prel/html-1.39.1-prel.vsix",
    "vscode-builtin-javascript": "https://github.com/theia-ide/vscode-builtin-extensions/releases/download/v1.39.1-prel/javascript-1.39.1-prel.vsix",
    "vscode-builtin-json": "https://github.com/theia-ide/vscode-builtin-extensions/releases/download/v1.39.1-prel/json-1.39.1-prel.vsix",
    "vscode-builtin-markdown": "https://github.com/theia-ide/vscode-builtin-extensions/releases/download/v1.39.1-prel/markdown-1.39.1-prel.vsix",
    "vscode-builtin-npm": "https://github.com/theia-ide/vscode-builtin-extensions/releases/download/v1.39.1-prel/npm-1.39.1-prel.vsix",
    "vscode-builtin-scss": "https://github.com/theia-ide/vscode-builtin-extensions/releases/download/v1.39.1-prel/scss-1.39.1-prel.vsix",
    "vscode-builtin-typescript": "https://github.com/theia-ide/vscode-builtin-extensions/releases/download/v1.39.1-prel/typescript-1.39.1-prel.vsix",
    "vscode-builtin-typescript-language-features": "https://github.com/theia-ide/vscode-builtin-extensions/releases/download/v1.39.1-prel/typescript-language-features-1.39.1-prel.vsix"
  }
}

otherwise run this on the folder where package.json is

error Command "start" not found.

yarn run theia start /home --hostname 0.0.0.0 --port 8080

theia should start on port 8080 minimally.

Answer 11

If you get error Command "start" not found. after creating new project using create-react-app you most probably would have created the app using npm .

To do it correctly delete the directory of the project and recreate the project using yarn with the following command

 yarn create react-app my-app

After that yarn start works perfectly fine.

Answer 12

i got the same issue. it cusses you have installed packages in wrong directory.

in cmd terminal:-(D:\\PROJECT)=> my cmd file path shows

D:\PROJECTS\npx create-react-app app-react

(when you enter this command it will create new file named app-react . then you have to go into the app-react file . use this command to go to the that file "cd app-react" then enter. you will see cmd path )

D:\PROJECTS\cd app-react
D:\PROJECTS\app-react\

then install other yarn packges

D:\PROJECTS\app-react\yarn add @chakra-ui/react @emotion/react@^11 @emotion/styled@^11 framer-motion@^4

D:\PROJECTS\app-react\yarn add react-icons

D:\PROJECTS\app-react\yarn add react-router-dom

then yarn start

D:\PROJECTS\app-react\yarn start

if it is won't open check yarn package installed using this command

D:\PROJECTS\app-react\yarn -version
1.22.10

for install yarn

npm install --global yarn

Answer 13

just run following commands:

1. npm uninstall -g create-react-app
2. npx create-react-app FolderName

Answer 14

I had a similar problem while I have "start" script in my package.json . Eventually, I figured out that I had not saved the package.json , so I got this error. Obviously, after saving the package.json the problem was resolved.

Answer 15

This issue happens when file "package.json" will gets deleted or changed. Please check your "package.json" file.

Answer 16

It may sound silly, but I was having this same problem and all I did was close the program (vscode), and reopen it. I made sure it was inside the correct project folder (web) and did the process again. It worked. In my case it was just a lack of attention.

I hope your problem is as simple as mine.

Hug!

Answer 17

i solve the problem whit this: Since create-react-app 3.3.0 it's not longer recommended to use a global installation of CRA.

However, after following the recommended way, uninstalling CRA globally and using npm,I ran into the following problem for my new React project:

A template was not provided. This is likely because you're using an outdated version of create-react-app.

It seems like CRA wasn't properly uninstalled. I had to do the following:

After uninstalling it with npm uninstall -g create-react-app, check whether you still have it "installed" with which create-react-app on your command line. If it returns something (eg /usr/local/bin/create-react-app), then do a rm -rf /usr/local/bin/create-react-app to delete manually.

Afterward, I was able to use npx create-react-app my-app with the latest version of CRA where I would have the default template for the src/ folder

Answer 18

Nov 2020

This might happen when you clone a git repo created with an older version of create-react-app or event with another setup. First install react-scripts as

yarn add react-scripts

Or

npm install react-scripts

Then if having problem with react-scripts, refer to this SO thread .

Answer 19

Firstly, you can try

npm install

then

You can also try to run first npm install and then npm run or first yarn and then yarn start

Answer 20

I have solved my issues with the following command. Try this command, hope you will get rid of the problems.

npm run start

Answer 21

I also face this error but in my case I think, I have done all the above steps but the error still remaining the last thing I did in my main node_module/.bin/ folder I saw there are two dependencies one is create-react-app it fine but another one is creat-app-react so I deleted this dependency and also remove from my package.json file.

So now yarn start is working perfectly.

Answer 22

好吧，我收到了这个错误，因为我很笨 没有进入主项目文件夹。所以它实际上也无法找到 .json 文件😁

Answer 23

just run command

corepack disable

if you ran the following command before

corepack enable

Answer 24

I was outside the project. So I type cd myProject and than yarn run

Answer 25

{
        test: /\.scss$/,
        include: [/vue-components|views/],
        use: [
          'vue-style-loader',
          'css-loader',
          'sass-loader',
        ],
},

put this in webpack.config.js in module object.

Answer 26

这背后的原因之一是注意如果你在正确的目录中，输入 cd your_file_name 然后输入 npm run dev

Answer 27

I had the same issue. Just run

npm install --global yarn

Answer 28

 "scripts": {
"start": "react-scripts start",
"build": "react-scripts build",
"test": "jest",
"eject": "react-scripts eject"  }, 

I found that when I added this into the scripts section package.json dependency; it worked! This way, you'll get the https://localhost:3000 instead of using the 8080 port.

Answer 29

I had this problem and just solved it! Super easy, I hope it helps you:

The problem: "node_modules" was duplicated. You may have accidentally downloaded a duplicated "node_modules" folder when calling yar originally.

Go to "User/#yourname/node_modules" and delete the folder.