# sanjai-dev46/sanjoelite-airline-platform architecture

> Architecture diagram of the GitHub repository sanjai-dev46/sanjoelite-airline-platform, generated by GitDiagram from its file tree, README and a sample of source files (last updated 2026-08-13). It is an AI-made overview: check details against the source.

- Interactive diagram: https://gitdiagram.com/sanjai-dev46/sanjoelite-airline-platform
- Repository: https://github.com/sanjai-dev46/sanjoelite-airline-platform

## Overview

#### Purpose and Top-Level Shape
Sanjo is a two-process airline-booking demo: a React SPA provides search, booking, payment, authentication, and booking-history flows; an Express server exposes mock API endpoints. The repository explicitly identifies database, JWT authentication, and payment-provider integration as future production work.

#### Runtime Entry Points
- Frontend bootstraps the Vite/React application at `frontend/src/main.tsx`; route composition is centered in `frontend/src/App.tsx`.
- Backend starts a Node.js/Express HTTP server from `backend/server.js`, intended to run on port 5000.
- The frontend development server proxies `/api` traffic to the backend, separating browser UI delivery from API handling.

#### Client Routing and Journey Stages
The UI is organized as route-level stages:
- Discovery and results: `frontend/src/pages/Home.tsx`, `frontend/src/pages/Search.tsx`, `frontend/src/pages/FlightDetails.tsx`.
- Transaction flow: `frontend/src/pages/Booking.tsx`, `frontend/src/pages/Payment.tsx`, `frontend/src/pages/Confirmation.tsx`.
- Account-oriented flows: `frontend/src/pages/Login.tsx`, `frontend/src/pages/Register.tsx`, `frontend/src/pages/BookingList.tsx`.

These pages are the primary client control-flow boundary: user selection moves from flight search through booking and payment to confirmation, while authenticated-user screens support registration/login and retrieval of bookings.

#### Frontend Domain Boundary
`frontend/src/services/api.ts` is the client API boundary and should isolate pages/components from HTTP endpoint details. Shared TypeScript contracts in `frontend/src/types/index.ts` provide the frontend’s domain model for flights, bookings, users, and related API data. This is the main place to align future backend schemas and error/auth behavior with the UI.

#### Presentation Composition
Reusable UI and domain-display components keep page routes focused on orchestration:
- Flight discovery and selection: `frontend/src/components/SearchBar.tsx`, `frontend/src/components/FlightCard.tsx`.
- Booking presentation: `frontend/src/components/BookingCard.tsx`.
- Application shell: `frontend/src/components/Navbar.tsx`, `frontend/src/components/Footer.tsx`.
Styling is locally built with Tailwind and global CSS through `frontend/tailwind.config.js` and `frontend/src/index.css`.

#### API and Data Layer
`backend/server.js` currently concentrates the Express API surface—flight management, booking, authentication, and payment endpoints—in one server module. The README characterizes its data as mock data; no database, persistent repository layer, JWT issuer, or third-party payment SDK appears in the supplied tree. Consequently, API state and business behavior are presently bounded by that single process.

#### Infrastructure and External Boundaries
- Frontend runtime: React 18, TypeScript, Vite, React Router, Tailwind (`frontend/package.json`).
- Backend runtime: Node.js, Express, CORS, dotenv (`backend/package.json`, `backend/.env.example`).
- Deployment targets are static frontend hosting (Vercel/Netlify) and a Node host (Heroku/Railway/Render). Future external-service boundaries are a database, JWT-based identity, and Stripe/PayPal-class payment processing.

Main entry points: [`backend/server.js`](https://github.com/sanjai-dev46/sanjoelite-airline-platform/blob/main/backend/server.js) (Flight, booking, auth & payment APIs), [`frontend/src/services/api.ts`](https://github.com/sanjai-dev46/sanjoelite-airline-platform/blob/main/frontend/src/services/api.ts) (Client API boundary), [`frontend/src/App.tsx`](https://github.com/sanjai-dev46/sanjoelite-airline-platform/blob/main/frontend/src/App.tsx) (Route composition), [`frontend/src/pages/Home.tsx`](https://github.com/sanjai-dev46/sanjoelite-airline-platform/blob/main/frontend/src/pages/Home.tsx) (Discovery & results)

## Diagram (Mermaid)

```mermaid
flowchart TD

subgraph group_frontend["React SPA"]
  node_vite(("Vite bootstrap<br/>frontend entry<br/>[main.tsx]"))
  node_app["Route composition<br/>React router<br/>[App.tsx]"]
  node_discovery["Discovery &amp; results<br/>route pages<br/>[Home.tsx]"]
  node_booking["Booking flow<br/>route pages<br/>[Booking.tsx]"]
  node_account["Account &amp; history<br/>route pages<br/>[Login.tsx]"]
  node_ui["Reusable UI<br/>components<br/>[SearchBar.tsx]"]
  node_contracts["Domain contracts<br/>TypeScript types<br/>[index.ts]"]
  node_client_api{{"Client API boundary<br/>API service<br/>[api.ts]"}}
end

subgraph group_backend["Express API"]
  node_express(("Express server<br/>backend entry<br/>[server.js]"))
  node_api_surface["Flight, booking, auth &amp; payment APIs<br/>endpoint surface<br/>[server.js]"]
  node_mock_state[("Mock data &amp; state<br/>in-memory data<br/>[server.js]")]
end

subgraph group_future["Future production services"]
  node_database[("Database<br/>persistent storage")]
  node_jwt{{"JWT identity<br/>authentication service"}}
  node_payment_provider{{"Payment provider<br/>external payment service"}}
end

node_vite -->|"boots"| node_app
node_app -->|"routes"| node_discovery
node_app -->|"routes"| node_booking
node_app -->|"routes"| node_account
node_discovery -->|"composes"| node_ui
node_booking -->|"composes"| node_ui
node_account -->|"composes"| node_ui
node_discovery -->|"searches flights"| node_client_api
node_booking -->|"books and pays"| node_client_api
node_account -->|"authenticates and loads bookings"| node_client_api
node_client_api -->|"uses"| node_contracts
node_client_api -->|"proxies /api"| node_express
node_express -->|"hosts"| node_api_surface
node_api_surface -->|"reads and updates"| node_mock_state
node_api_surface -.->|"future persistence"| node_database
node_api_surface -.->|"future token auth"| node_jwt
node_api_surface -.->|"future payment processing"| node_payment_provider

click node_vite "https://github.com/sanjai-dev46/sanjoelite-airline-platform/blob/main/frontend/src/main.tsx"
click node_app "https://github.com/sanjai-dev46/sanjoelite-airline-platform/blob/main/frontend/src/App.tsx"
click node_discovery "https://github.com/sanjai-dev46/sanjoelite-airline-platform/blob/main/frontend/src/pages/Home.tsx"
click node_booking "https://github.com/sanjai-dev46/sanjoelite-airline-platform/blob/main/frontend/src/pages/Booking.tsx"
click node_account "https://github.com/sanjai-dev46/sanjoelite-airline-platform/blob/main/frontend/src/pages/Login.tsx"
click node_ui "https://github.com/sanjai-dev46/sanjoelite-airline-platform/blob/main/frontend/src/components/SearchBar.tsx"
click node_contracts "https://github.com/sanjai-dev46/sanjoelite-airline-platform/blob/main/frontend/src/types/index.ts"
click node_client_api "https://github.com/sanjai-dev46/sanjoelite-airline-platform/blob/main/frontend/src/services/api.ts"
click node_express "https://github.com/sanjai-dev46/sanjoelite-airline-platform/blob/main/backend/server.js"
click node_api_surface "https://github.com/sanjai-dev46/sanjoelite-airline-platform/blob/main/backend/server.js"
click node_mock_state "https://github.com/sanjai-dev46/sanjoelite-airline-platform/blob/main/backend/server.js"

classDef toneNeutral fill:#f8fafc,stroke:#334155,stroke-width:1.5px,color:#0f172a
classDef toneBlue fill:#dbeafe,stroke:#2563eb,stroke-width:1.5px,color:#172554
classDef toneAmber fill:#fef3c7,stroke:#d97706,stroke-width:1.5px,color:#78350f
classDef toneMint fill:#dcfce7,stroke:#16a34a,stroke-width:1.5px,color:#14532d
classDef toneRose fill:#ffe4e6,stroke:#e11d48,stroke-width:1.5px,color:#881337
classDef toneIndigo fill:#e0e7ff,stroke:#4f46e5,stroke-width:1.5px,color:#312e81
classDef toneTeal fill:#ccfbf1,stroke:#0f766e,stroke-width:1.5px,color:#134e4a
class node_vite,node_app,node_discovery,node_booking,node_account,node_ui,node_contracts,node_client_api toneBlue
class node_express,node_api_surface,node_mock_state toneAmber
class node_database,node_jwt,node_payment_provider toneMint
```

## Components

### React SPA

- [Vite bootstrap](https://github.com/sanjai-dev46/sanjoelite-airline-platform/blob/main/frontend/src/main.tsx): frontend entry · `frontend/src/main.tsx`
- [Route composition](https://github.com/sanjai-dev46/sanjoelite-airline-platform/blob/main/frontend/src/App.tsx): React router · `frontend/src/App.tsx`
- [Discovery & results](https://github.com/sanjai-dev46/sanjoelite-airline-platform/blob/main/frontend/src/pages/Home.tsx): route pages · Home, search, and flight-details journey stages. · `frontend/src/pages/Home.tsx`
- [Booking flow](https://github.com/sanjai-dev46/sanjoelite-airline-platform/blob/main/frontend/src/pages/Booking.tsx): route pages · Booking, payment, and confirmation stages. · `frontend/src/pages/Booking.tsx`
- [Account & history](https://github.com/sanjai-dev46/sanjoelite-airline-platform/blob/main/frontend/src/pages/Login.tsx): route pages · Login, registration, and booking-history screens. · `frontend/src/pages/Login.tsx`
- [Reusable UI](https://github.com/sanjai-dev46/sanjoelite-airline-platform/blob/main/frontend/src/components/SearchBar.tsx): components · Search, flight, booking-card, and shell presentation. · `frontend/src/components/SearchBar.tsx`
- [Domain contracts](https://github.com/sanjai-dev46/sanjoelite-airline-platform/blob/main/frontend/src/types/index.ts): TypeScript types · Flight, booking, user, and API data models. · `frontend/src/types/index.ts`
- [Client API boundary](https://github.com/sanjai-dev46/sanjoelite-airline-platform/blob/main/frontend/src/services/api.ts): API service · Isolates pages from HTTP endpoint details. · `frontend/src/services/api.ts`

### Express API

- [Express server](https://github.com/sanjai-dev46/sanjoelite-airline-platform/blob/main/backend/server.js): backend entry · Node HTTP server on port 5000. · `backend/server.js`
- [Flight, booking, auth & payment APIs](https://github.com/sanjai-dev46/sanjoelite-airline-platform/blob/main/backend/server.js): endpoint surface · All current API behavior is concentrated in the server module. · `backend/server.js`
- [Mock data & state](https://github.com/sanjai-dev46/sanjoelite-airline-platform/blob/main/backend/server.js): in-memory data · No persistent repository or database exists. · `backend/server.js`

### Future production services

- **Database**: persistent storage · Planned production persistence boundary.
- **JWT identity**: authentication service · Planned token-based authentication boundary.
- **Payment provider**: external payment service · Planned Stripe/PayPal-class integration.

## Connections

- Vite bootstrap → Route composition: boots
- Route composition → Discovery & results: routes
- Route composition → Booking flow: routes
- Route composition → Account & history: routes
- Discovery & results → Reusable UI: composes
- Booking flow → Reusable UI: composes
- Account & history → Reusable UI: composes
- Discovery & results → Client API boundary: searches flights
- Booking flow → Client API boundary: books and pays
- Account & history → Client API boundary: authenticates and loads bookings
- Client API boundary → Domain contracts: uses
- Client API boundary → Express server: proxies /api
- Express server → Flight, booking, auth & payment APIs: hosts
- Flight, booking, auth & payment APIs → Mock data & state: reads and updates
- Flight, booking, auth & payment APIs → Database: future persistence
- Flight, booking, auth & payment APIs → JWT identity: future token auth
- Flight, booking, auth & payment APIs → Payment provider: future payment processing