Unable to run "npm start" shows error. how to resolve?

Question

Getting error while running comment "npm start" in windows 10.

showing error

Package.json

Packages.json

Log

• 0 info it worked if it ends with ok
• 1 verbose cli [ 'C:\Program Files\nodejs\node.exe',
• 1 verbose cli 'C:\Users\vkarutha\AppData\Roaming\npm\node_modules\npm\bin\npm-cli.js',
• 1 verbose cli 'start' ]
• 2 info using npm@4.2.0
• 3 info using node@v6.9.3
• 4 verbose run-script [ 'prestart', 'start', 'poststart' ]
• 5 info lifecycle hello-world@0.1.0~prestart: hello-world@0.1.0
• 6 silly lifecycle hello-world@0.1.0~prestart: no script for prestart, continuing
• 7 info lifecycle hello-world@0.1.0~start: hello-world@0.1.0
• 8 verbose lifecycle hello-world@0.1.0~start: unsafe-perm in lifecycle true
• 9 verbose lifecycle hello-world@0.1.0~start: PATH: C:\Users\vkarutha\AppData\Roaming\npm\node_modules\npm\bin\node-gyp-bin;C:\Users\vkarutha\Documents\React\hello-world\node_modules.bin;C:\ProgramData\Oracle\Java\javapath;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\WebEx\Productivity Tools;C:\Program Files (x86)\Cisco\OSD-ShellApplications;C:\Program Files\Java\jdk1.8.0_101\bin;C:\Cisco\software\apache-maven-3.3.9\bin;C:\Program Files\Git\cmd;C:\Program Files\nodejs\;C:\Program Files\TortoiseSVN\bin;C:\Program Files\nodejs\bin;C:\Program Files (x86)\Sennheiser\SoftphoneSDK\;C:\Program Files (x86)\ssh communications security\ssh Secure Shell;C:\Users\vkarutha\AppData\Roaming\npm;C:\Program Files (x86)\Microsoft VS Code\bin;C:\Program Files\nodejs\bin
• 10 verbose lifecycle hello-world@0.1.0~start: CWD: C:\Users\vkarutha\Documents\React\hello-world
• 11 silly lifecycle hello-world@0.1.0~start: Args: [ '/d /s /c', 'webpack-dev-server --hot' ]
• 12 silly lifecycle hello-world@0.1.0~start: Returned: code: 4294967295 signal: null
• 13 info lifecycle hello-world@0.1.0~start: Failed to exec start script
• 14 verbose stack Error: hello-world@0.1.0 start: webpack-dev-server --hot
• 14 verbose stack Exit status 4294967295
• 14 verbose stack at EventEmitter. (C:\Users\vkarutha\AppData\Roaming\npm\node_modules\npm\lib\utils\lifecycle.js:279:16)
• 14 verbose stack at emitTwo (events.js:106:13)
• 14 verbose stack at EventEmitter.emit (events.js:191:7)
• 14 verbose stack at ChildProcess. (C:\Users\vkarutha\AppData\Roaming\npm\node_modules\npm\lib\utils\spawn.js:40:14)
• 14 verbose stack at emitTwo (events.js:106:13)
• 14 verbose stack at ChildProcess.emit (events.js:191:7)
• 14 verbose stack at maybeClose (internal/child_process.js:877:16)
• 14 verbose stack at Process.ChildProcess._handle.onexit (internal/child_process.js:226:5)
• 15 verbose pkgid hello-world@0.1.0
• 16 verbose cwd C:\Users\vkarutha\Documents\React\hello-world
• 17 error Windows_NT 10.0.10586
• 18 error argv "C:\Program Files\nodejs\node.exe" "C:\Users\vkarutha\AppData\Roaming\npm\node_modules\npm\bin\npm-cli.js" "start"
• 19 error node v6.9.3
• 20 error npm v4.2.0
• 21 error code ELIFECYCLE
• 22 error errno 4294967295
• 23 error hello-world@0.1.0 start: webpack-dev-server --hot
• 23 error Exit status 4294967295
• 24 error Failed at the hello-world@0.1.0 start script 'webpack-dev-server --hot'.
• 24 error Make sure you have the latest version of node.js and npm installed.
• 24 error If you do, this is most likely a problem with the hello-world package,
• 24 error not with npm itself.
• 24 error Tell the author that this fails on your system:
• 24 error webpack-dev-server --hot
• 24 error You can get information on how to open an issue for this project with:
• 24 error npm bugs hello-world
• 24 error Or if that isn't available, you can get their info via:
• 24 error npm owner ls hello-world
• 24 error There is likely additional logging output above.
• 25 verbose exit [ 4294967295, true ]

webpack.config.js

var config = {
   entry: './main.js',

   output: {
      path:'./',
      filename: 'index.js',
   },

   devServer: {
      inline: true,
      port: 8080
   },

   module: {
      loaders: [
         {
            test: /\.jsx?$/,
            exclude: /node_modules/,
            loader: 'babel',

            query: {
               presets: ['es2015', 'react']
            }
         }
      ]
   }
}

Answer 1

There is a problem with your webpack.config.js file. You need to export the config object like this-

module.exports = {
   entry: './main.js',

   output: {
      path:'./',
      filename: 'index.js',
   },

   devServer: {
      inline: true,
      port: 8080
   },

   module: {
      loaders: [
         {
            test: /\.jsx?$/,
            exclude: /node_modules/,
            loader: 'babel',

            query: {
               presets: ['es2015', 'react']
            }
         }
      ]
   }
}

Answer 2

Try typing npm run start alt npm r start

navigate to the same folder where the package.json is located type npm install to get all the dependencies. type npm run start

Do you have the webpack.config.js?

Could be malformed webpack config: This is how mine looks, (replace with your stuff):

var path = require('path');

module.exports = {
    context: path.resolve('src/main'),
    entry: {
        myapp: './dependencies.js',
    },
    output: {
        path: path.resolve('build/dev'),
        filename: '[name].js'
    },
    module: {
        loaders: [
            {
                test: /.(png|jpg|jpeg|gif|svg|woff|woff2|eot|ttf)(.*)$/,
                loader: 'url-loader?limit=100000'
            },
            {
                test: /\.css$/,
                loader: 'style-loader!css-loader'
            }
        ]
    }

};