# lwr dev

The `lwr dev` command starts a local development server that recompiles the source when it observes changes to local files. You can append `{options}` to this on the command line to configure settings like port number and server mode for your local server.

| 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`. |
| `-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 dev` options in the CLI.                                                                                                                                                                           |