hmr eer empty response - Troubleshooting

Also valid for kool run yarn run hot or kool run yarn run dev


Browser cannot request "HMR" (hot module replacement) server successfully in Laravel Mix or Laravel Vite.



Publish the HMR's port to the host and change HMR settings to listen on all IPv4 addresses (

For the sake of clarity, let's elect port 8080 to publish.

In your kool.yml, apply the following changes:

-npm: kool docker kooldev/node:20 npm +npm: kool docker -p 8080:8080 kooldev/node:20 npm
  • Alternatively, if you don't want to publish the port for your general kool run npm commands, you may add a new entry.

> Laravel Mix

In your webpack.mix.js, include the following changes to the mix.options call.

mix.options({ + hmrOptions: { + host: '', + port: 8080, + }, });

> Laravel Vite

In your vite.config.js file, include the following changes to the defineConfig call.

export default defineConfig({ + server: { + host: '', + port: 8080, + }, plugins: [ laravel({ input: ['resources/css/app.css', 'resources/js/app.js'], refresh: true, }), ], });
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