React JavaScript Example

This project is a note-taking app template built with React, JavaScript, and Tailwind CSS, designed to demonstrate integration with Juno for app development. It showcases authentication, data storage, and file storage using Juno's Satellite container.

You can scaffold it using the following command, or browse the source code:

npm create juno@latest -- --template react-example

Source: github.com/junobuild/create-juno/templates/react-example

---

Folder Structure

react-example/
├── public/                # Static assets
├── src/
│   ├── components/        # React UI components (Auth, Table, Modal, Banner, etc.)
│   ├── App.jsx            # Main app component
│   ├── main.jsx           # React entry point
│   └── index.css          # Tailwind CSS styles
├── juno.config.mjs        # Juno Satellite configuration
├── package.json           # Project dependencies and scripts
├── vite.config.js         # Vite build configuration
├── README.md              # User-facing documentation
└── ...                    # Other config and build files

---

Key Features

• Juno Integration: Uses Juno's Satellite for authentication, Datastore, and Storage.
• Authentication: Login/logout flow.
• Notes Collection: Users can create, view, and delete notes (text, with optional file URL).
• Images Collection: Supports file storage for images.
• Responsive UI: Built with Tailwind CSS for modern styling.
• Banner: Warns if the Satellite is not configured for local development.

---

Main Components

• App.jsx: Initializes Juno Satellite, renders the main layout, and wraps content in authentication.
• Banner.jsx: Shows a warning if the Satellite ID is missing in local dev.
• Auth.jsx: Provides authentication context and login/logout UI.
• Table.jsx: Displays the list of notes from the Datastore.
• Modal.jsx: Handles note creation and editing.
• Delete.jsx: Handles note deletion.
• Footer.jsx, Background.jsx, Button.jsx, etc.: UI and utility components.

---

Data Structure

• Note (used in Table.jsx):

// Example note object
{
  key: string,
  data: {
    text: string,
    url?: string
  }
}

---

How to Run

1. Install dependencies:

npm install

2. Start Juno local emulator:

important

Requires the Juno CLI to be available npm i -g @junobuild/cli

juno dev start

3. Create a Satellite for local dev:

• Visit http://localhost:5866 and follow the instructions.
• Update juno.config.mjs with your Satellite ID.

4. Create required collections:

• notes in Datastore: http://localhost:5866/datastore
• images in Storage: http://localhost:5866/storage

5. Start the frontend dev server (in a separate terminal):

npm run start

---

Juno-Specific Configuration

• juno.config.mjs: Defines Satellite IDs for development/production, build source, and predeploy steps.

---

Production Deployment

• Create a Satellite on the Juno Console for mainnet.
• Update juno.config.mjs with the production Satellite ID.
• Build and deploy:

npm run build
juno deploy

---

Notes

• The app is intended as a starting point for Juno-based projects.
• All logic is in JavaScript and React function components.
• The app is fully client-side (Server Side Rendering is not supported yet) and interacts with Juno via the Satellite container.

---

Juno SDK Used

The following functions from @junobuild/core are used in this example:

Function	Purpose/Description	Where Used (File/Component)	Juno Docs/Source Reference
initSatellite	Initialize Juno Satellite container	src/App.jsx	Initialization
authSubscribe	Subscribe to auth state changes	src/components/Auth.jsx	Subscription
signIn	Sign in user	src/components/Login.jsx	Sign-in
signOut	Sign out user	src/components/Logout.jsx	Sign-out
listDocs	List documents in a collection	src/components/Table.jsx	List documents
setDoc	Create or update a document	src/components/Modal.jsx	Add a document
deleteDoc	Delete a document	src/components/Delete.jsx	Delete a document
uploadFile	Upload a file to storage	src/components/Modal.jsx	Upload asset
deleteAsset	Delete a file from storage	src/components/Delete.jsx	Delete asset