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Next.js Deployment Guide

Understand the .next folder

The .next folder is generated when your application is built. Which is either done using the npm run build command, or when you run the server in development mode e.g. npm run local. The .next folder contains the following:

  • BUILD_ID The build id that was generated for the application.
  • build-manifest.json File that contains a mapping for all assets.
  • bundles Folder that contains all build files for client usage.
  • static Static files that are generated through WebPack.
  • server Folder that contains all files that are used on the server.
    • bundles All build files, but for server usage.
    • pages-manifest.json Identical to build-manifest.json but for server.
    • static Static files to be used on the server.

All these files are needed to render your application server side or client side.

To CDN or not to CDN

By default all the files that are in the .next folder will be hosted on your application server. As most of these contain static files, it might make sense for you application to upload it to the CDN.

If you decide to upload these to the CDN you need to instruct the application to reference the files from the CDN instead of the application server. This is done by setting the assetPrefix to the host/path of the CDN server.

You want to make sure that you only set the assetPrefix for production environments so that when you are developing your application all assets are still hosted on the application server. You can do this by setting environment specific configuration in your gasket.config.js:

{
  environments: {
    production: {
      nextConfig: {
        assetPrefix: 'https://<your cdn base url>/<directory that contains .next folder>'
      }
    }
  }
}

Install production only dependencies

When you are deploying your application to production, make sure you only install the --production dependencies to speed up the installation:

npm install --production

Build for production

For production builds, you want to ensure that you end up with the smallest bundle possible, so we need to set the NODE_ENV=production flag to instruct the libraries to only include the code that is needed for production:

NODE_ENV=production npm run build

The gasket.config.js contains environment specific configuration

There are values in the configuration that you might want to adjust when you deploy to production, for example the hostname of your application, the port number you deploy on, or even HTTPS options if that is not terminated at a load balancer level.

Update your gasket.config.js file to include an environments object with configuration values for the environments you deploy on:

{
  environments: {
    production: {
      hostname: '<appname>.your-url.com',
      port: 8080,

      //
      // Rest of your production configuration here.
      //
    }
  }
}

See the configuration guide for more detailed information.

What files should be included in your production deployment

Ensure that the following files are included when you deploy your application:

  • .next (folder) This contains the output of the WebPack builds
  • locales (folder) Intl information
  • plugins (folder) Plugins that you've written for Gasket
  • lifecycles (folder) Lifecycle function to interact with Gasket
  • config (folder) Environment specific configuration
  • static (folder) Static files that need to be hosted
  • node_modules (folder)
  • package.json Scripts and dependencies for your project
  • package-lock.json Automatically generated file about the installed dependencies
  • .babelrc Config file for babel
  • gasket.config.js Config file for Gasket
  • store.js Scripts for creating a redux store and/or attaching a reducer

Deployment checklist

  • npm run analyze is ran and the application dependency tree is optimized
  • npm test is passing
  • npm run lint does not contain any warnings
  • npm audit does not contain any issues about top level dependencies
  • All dependencies that are used are correctly licensed.
  • NODE_ENV=production npm run build is ran
  • SSL certificates are setup and correctly configured in gasket.config
  • gasket.config.js contains environment.production with prod settings
  • Bumped the version in package.json, following the semver standard

Sample Dockerfile

You can also define a container for a gasket app to run with a Dockerfile. Follow the Docker deployment guide to see a sample Dockerfile.