file. Open your `compose.yaml` file in an IDE or text editor, and then add the
`target: dev` instruction to target the `dev` stage from your multi-stage
Dockerfile.

Also, add a new volume to the server service for the bind mount. For this application, you'll mount `./src` from your local machine to `/usr/src/app/src` in the container.

Lastly, publish port `9229` for debugging.

The following is the updated Compose file. All comments have been removed.

```yaml {hl_lines=[5,8,20,21],collapse=true,title=compose.yaml}
services:
  server:
    build:
      context: .
      target: dev
    ports:
      - 3000:3000
      - 9229:9229
    environment:
      NODE_ENV: production
      POSTGRES_HOST: db
      POSTGRES_USER: postgres
      POSTGRES_PASSWORD_FILE: /run/secrets/db-password
      POSTGRES_DB: example
    depends_on:
      db:
        condition: service_healthy
    secrets:
      - db-password
    volumes:
      - ./src:/usr/src/app/src
  db:
    image: postgres
    restart: always
    user: postgres
    secrets:
      - db-password
    volumes:
      - db-data:/var/lib/postgresql/data
    environment:
      - POSTGRES_DB=example
      - POSTGRES_PASSWORD_FILE=/run/secrets/db-password
    expose:
      - 5432
    healthcheck:
      test: ["CMD", "pg_isready"]
      interval: 10s
      timeout: 5s
      retries: 5
volumes:
  db-data:
secrets:
  db-password:
    file: db/password.txt
```

### Run your development container and debug your application

Run the following command to run your application with the new changes to the `Dockerfile` and `compose.yaml` file.

```console
$ docker compose up --build
```

Open a browser and verify that the application is running at [http://localhost:3000](http://localhost:3000).

Any changes to the application's source files on your local machine will now be
immediately reflected in the running container.

Open `docker-nodejs-sample/src/static/js/app.js` in an IDE or text editor and update the button text on line 109 from `Add Item` to `Add`.

```diff
+                         {submitting ? 'Adding...' : 'Add'}
-                         {submitting ? 'Adding...' : 'Add Item'}
```

Refresh [http://localhost:3000](http://localhost:3000) in your browser and verify that the updated text appears.

You can now connect an inspector client to your application for debugging. For
more details about inspector clients, see the [Node.js
documentation](https://nodejs.org/en/docs/guides/debugging-getting-started).

## Summary

In this section, you took a look at setting up your Compose file to add a mock
database and persist data. You also learned how to create a multi-stage
Dockerfile and set up a bind mount for development.

Related information:

- [Volumes top-level element](/reference/compose-file/volumes/)
- [Services top-level element](/reference/compose-file/services/)
- [Multi-stage builds](/manuals/build/building/multi-stage.md)

## Next steps

In the next section, you'll learn how to run unit tests using Docker.