Mitchell Hillman

Environment variables with webpack

Webpack supports environment variables at build time using the DefinePlugin. I used this technique to avoid manually setting environment specific values in my single page application.

In webpack.config.js:

module.exports = (env) => {
  return {
    // other settings...
    plugins: [
      new webpack.DefinePlugin({
        "process.env.development": JSON.stringify(env.development),
        "process.env.local": JSON.stringify(env.local),

Then, in my application I can access the process.env. For example:

const config = process.env.local ? localConfig : deployedConfig;

For more details see webpack’s own documentation for the Environment Plugin