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Command Line Interface

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SvelteKit includes a command line interface for building and running your app.

In the default project template svelte-kit dev, svelte-kit build and svelte-kit preview are aliased as npm run dev, npm run build and npm run preview respectively. You can also invoke the CLI with npx:

npx svelte-kit dev

svelte-kit dev

Starts a development server. It accepts the following options:

  • -p/--port — which port to start the server on
  • -o/--open — open a browser tab once the server starts
  • -h/--host — expose the server to the network.
  • -H/--https — launch an HTTPS server using a self-signed certificate. Useful for testing HTTPS-only features on an external device

svelte-kit build

Builds a production version of your app, and runs your adapter if you have one specified in your config. It accepts the following option:

  • --verbose — log more detail

After building the app, you can reference the documentation of your chosen adapter and hosting platform for specific instructions on how to serve your app.

svelte-kit preview

After you've built your app with svelte-kit build, you can start the production version (irrespective of any adapter that has been applied) locally with svelte-kit preview. This is intended for testing the production build locally, not for serving your app, for which you should always use an adapter.

Like svelte-kit dev, it accepts the following options:

  • -p/--port
  • -o/--open
  • -h/--host
  • -H/--https

svelte-kit package

For package authors, see packaging.

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