> For the complete documentation index, see [llms.txt](https://docs.kepler.gl/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.kepler.gl/examples/demo-app.md).

# Demo App

This is the src code of kepler.gl demo app. You can copy this folder out and run it locally.

#### Pre requirement

* [Node.js ^20.x](http://nodejs.org): We use Node to generate the documentation, run a development web server, run tests, and generate distributable files. Depending on your system, you can install Node either from source or as a pre-packaged bundle.
* [Yarn 4.4.0](https://yarnpkg.com): We use Yarn to install our Node.js module dependencies (rather than using npm). See the detailed [installation instructions](https://yarnpkg.com/getting-started/install).

#### 1. Install Dependencies

Go to the root directory and install the dependencies using yarn:

```sh
yarn bootstrap
```

If install fails while building the `gl` package, use Node 20.19.3 from the repo root `.nvmrc` (`nvm install` / `nvm use`), or see [Troubleshooting: gl package install](/contributing/developers.md#troubleshooting-gl-package-install).

If `yarn start` errors with missing `@kepler.gl/duckdb/components` (or other workspace `dist/` files), from the repo root run `yarn workspaces foreach -At run stab` or run full `yarn bootstrap` (not only `yarn install`).

Then, go to the `examples/demo-app` directory and install the dependencies using yarn:

```sh
yarn install
```

#### 2. Environment Variables

Create a `.env` file at the root directory by copying from `.env.template`:

```sh
cp .env.template .env
```

Then update the following environment variables in your `.env` file:

```sh
MAPBOX_ACCESS_TOKEN=<your_mapbox_token>
DROPBOX_CLIENT_ID=<your_dropbox_client_id>
MAPBOX_EXPORT_TOKEN=<your_mapbox_export_token>
CARTO_CLIENT_ID=<your_carto_client_id>
FOURSQUARE_CLIENT_ID=<your_foursquare_client_id>
FOURSQUARE_DOMAIN=<your_foursquare_domain>
FOURSQUARE_USER_MAPS_URL=<your_foursquare_user_map_url>
```

#### 3. Start the app

```sh
yarn start:local
```


---

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