webpack-dev-server Cannot find module 'webpack'

I'm trying to use webpack-dev-server to run a simple program but I'm getting this error:

module.js:471 throw err; ^ Error: Cannot find module 'webpack' at Function.Module._resolveFilename (module.js:469:15) at Function.Module._load (module.js:417:25) at Module.require (module.js:497:17) at require (internal/module.js:20:19) at Object.<anonymous> at Module._compile (module.js:570:32) at Object.Module._extensions..js (module.js:579:10) at Module.load (module.js:487:32) at tryModuleLoad (module.js:446:12) at Function.Module._load (module.js:438:3) 

I have installed webpack with following npm command

npm install --save-dev webpack 

and I have the following configuration:

(webpack.config.js) var webpack = require('webpack'); var path = require('path'); var BUILD_DIR = path.resolve(__dirname, 'client/public'); var APP_DIR = path.resolve(__dirname, 'client/app'); var config = { entery: APP_DIR + '/index.js', output: { path: BUILD_DIR, filename: 'bundle,js', }, module: { loaders: [ { test: /.jsx?$/, loader: 'babel-loader', exclude: /node_modules/, query: { presets: ['es2015', 'react'] } } ] } }; module.exports = config; 

I have tried everything and I'm really lost. Does anyone have any idea?

3 Answers

npm install --save-dev webpack is not enough.

You also have to install the following:

npm install --save-dev webpack-dev-server 

And optionally, you can also install:

npm install --save-dev webpack-dev-middleware webpack-hot-middleware 

I had the same problem, but I resolved by installing additional webpack-cli

npm install --save-dev webpack-cli 

Try the following:

Firstly, you need to install webpack-dev-server

npm install --save-dev webpack-dev-server

Then in your package.json, use this in your start script:

"start": "webpack serve --config webpack.config.js --open"

Note webpack.config.js should be replaced with the file name of your webpack config file.

Now run npm start

Hope it works!