# lwr start|preview

To preview your site in its target environment after you successfully run `lwr build`, run `lwr start` or `lwr preview`.

If you run this command without a prebuilt directory, it'll default to the standard LWR standalone server and it won't use any statically generated content.

| Option                        | Type    | Required/Optional | Description                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
| ----------------------------- | ------- | ----------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `-p`, `--port <port>`         | Number  | Optional          | Set the [port](/docs/platform/lwr/guide/lwr-configure-project.md#configure-the-port-and-server) for the local development server. If a port isn't specified, the default value is `3000`.                                                                                                                                                                                                                                                                                 |
| `-m`, `--mode <mode>`         | String  | Optional          | Set the [server mode](/docs/platform/lwr/guide/lwr-get-started.md#set-the-lwr-server-modes). If a server mode isn't specified, the default value is `dev`. Accepted values are `dev`, `compat`, `prod-compat`, and `prod`.                                                                                                                                                                                                                                                |
| `-t`, `--target <target>`     | String  | Optional          | Set the site deployment target. If a target isn't specified, the default value is `default`. Accepted values are: <ul><li>`default` - Generates the static site wouthout any configuration options.</li><li>`mrt` - Generates the static site with a [Managed Runtime configuration.](https://developer.salesforce.com/docs/commerce/pwa-kit-managed-runtime/guide/mrt-overview.md)</li><li>`netlify` - Generates the static site with a Netlify configuration.</li></ul> |
| `-b`, `-buildDir <directory>` | String  | Optional          | Specify the prebuilt directory for your static site.                                                                                                                                                                                                                                                                                                                                                                                                                      |
| `-o`, `--open`                | Boolean | Optional          | Open the static site in the browser on startup. By default, the browser doesn't open on startup.                                                                                                                                                                                                                                                                                                                                                                          |
| `-h`, `--help`                |         | Optional          | View help text for `lwr start` and `lwr preview` options in the CLI.                                                                                                                                                                                                                                                                                                                                                                                                      |