exportPathMap

This feature is exclusive to next export and currently deprecated in favor of getStaticPaths with pages or generateStaticParams with app.

exportPathMap allows you to specify a mapping of request paths to page destinations, to be used during export. Paths defined in exportPathMap will also be available when using next dev.

Let's start with an example, to create a custom exportPathMap for an app with the following pages:

• pages/index.js
• pages/about.js
• pages/post.js

Open next.config.js and add the following exportPathMap config:

module.exports = {
  exportPathMap: async function (
    defaultPathMap,
    { dev, dir, outDir, distDir, buildId }
  ) {
    return {
      '/': { page: '/' },
      '/about': { page: '/about' },
      '/p/hello-nextjs': { page: '/post', query: { title: 'hello-nextjs' } },
      '/p/learn-nextjs': { page: '/post', query: { title: 'learn-nextjs' } },
      '/p/deploy-nextjs': { page: '/post', query: { title: 'deploy-nextjs' } },
    }
  },
}

Good to know: the query field in exportPathMap cannot be used with automatically statically optimized pages or getStaticProps pages as they are rendered to HTML files at build-time and additional query information cannot be provided during next export.

The pages will then be exported as HTML files, for example, /about will become /about.html.

exportPathMap is an async function that receives 2 arguments: the first one is defaultPathMap, which is the default map used by Next.js. The second argument is an object with:

• dev - true when exportPathMap is being called in development. false when running next export. In development exportPathMap is used to define routes.
• dir - Absolute path to the project directory
• outDir - Absolute path to the out/ directory (configurable with -o). When dev is true the value of outDir will be null.
• distDir - Absolute path to the .next/ directory (configurable with the distDir config)
• buildId - The generated build id

The returned object is a map of pages where the key is the pathname and the value is an object that accepts the following fields:

• page: String - the page inside the pages directory to render
• query: Object - the query object passed to getInitialProps when prerendering. Defaults to {}

The exported pathname can also be a filename (for example, /readme.md), but you may need to set the Content-Type header to text/html when serving its content if it is different than .html.

Adding a trailing slash

It is possible to configure Next.js to export pages as index.html files and require trailing slashes, /about becomes /about/index.html and is routable via /about/. This was the default behavior prior to Next.js 9.

To switch back and add a trailing slash, open next.config.js and enable the trailingSlash config:

module.exports = {
  trailingSlash: true,
}

Customizing the output directory

next export will use out as the default output directory, you can customize this using the -o argument, like so:

next export -o outdir

Warning: Using exportPathMap is deprecated and is overridden by getStaticPaths inside pages. We don't recommend using them together.