---
url: /glimpse/applets/exec/live-reload.md
---
# Develop with live reload

Attach an applet project to your running panel and apply changes as you save. Start with a project created by [the todo tutorial](/applets/exec/).

## Start the development run

From the project directory, run:

```sh
just dev
```

The applet appears in the running panel. If a configured applet on that bar already resolves to the same desktop id, development takes over that slot. Keep the terminal open to see stderr and build errors.

## Change options without restarting

For an applet that reads `options.title`, set `devconfig.toml` in the project to:

```toml
options = { title = "Groceries" }
```

Save it. The CLI prints `options updated`, and `useOptions()` receives the new object without restarting the process. This is the project's local configuration, separate from your panel configuration.

## Change source and restart

Edit `index.tsx` and save. The CLI prints the changed file, runs `just build`, and restarts the applet. A failed build keeps the running applet. Changes under hidden paths, `node_modules`, `build`, and `dist` do not trigger source restarts.

Changing `env` in the local configuration also restarts the applet. Development runs do not restart on failure. If the applet stops after an error, fix the source and save, or type `r` followed by Enter in the development terminal to restart it. Type `t` and Enter to print the current tree as the panel holds it.

Press Ctrl-C to detach the development run. See [the CLI reference](/config/cli/glimpsectl#glimpsectl-applet) for panel, output, zone, environment, and alternate configuration options.