sapper/site/content/docs/13-base-urls.md

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Base URLs

Ordinarily, the root of your Sapper app is served at /. But in some cases, your app may need to be served from a different base path — for example, if Sapper only controls part of your domain, or if you have multiple Sapper apps living side-by-side.

This can be done like so:

// app/server.js

express() // or Polka, or a similar framework
  .use(
    '/my-base-path', // <!-- add this line
    compression({ threshold: 0 }),
    serve('assets'),
    sapper.middleware()
  )
  .listen(process.env.PORT);

Sapper will detect the base path and configure both the server-side and client-side routers accordingly.

If you're exporting your app, you will need to tell the exporter where to begin crawling:

sapper export --basepath my-base-path