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🏥 HealthFlow — Medical Consultation Platform

HealthFlow is a full-stack healthcare management platform that connects patients, doctors, secretaries, and administrators through a unified web application. It supports appointment booking (physical & online), real-time messaging, medical records, schedule management, and in-app notifications — all powered by a .NET 8 REST API with SignalR real-time capabilities and a Next.js 16 React frontend.

Table of Contents

Features

Module Highlights
Authentication JWT-based login/register, role-based access, refresh tokens, forgot/reset password
Patient Portal Browse doctors by specialization/clinic, book appointments (physical or online), view medical records, manage profile
Doctor Portal Manage weekly schedule & availability, view appointments, write medical records, real-time chat with secretaries
Secretary Portal Manage appointments on behalf of doctors, view patient info, real-time chat with assigned doctors
Admin Panel Full CRUD for users, doctors, secretaries, clinics, specializations; dashboard statistics
Real-Time Chat Doctor ↔ Secretary messaging via SignalR rooms, unread badges, typing indicators
Notifications In-app notification bell with live badge count, real-time push via SignalR, notification history
Appointments Create, approve, decline, cancel, complete workflow; real-time status updates
Medical Records Create/view records per patient with file attachments
File Uploads Profile pictures, medical record attachments, secure file storage

Tech Stack

Backend

Technology Purpose
.NET 8 / ASP.NET Core REST API framework
Entity Framework Core 8 ORM / database access
PostgreSQL (Neon) Cloud relational database
SignalR Real-time WebSocket communication
JWT Bearer Authentication & authorization
BCrypt Password hashing
Swagger / Swashbuckle API documentation
Bogus Database seeding with realistic fake data

Frontend

Technology Purpose
Next.js 16 React framework with App Router
React 19 UI library
TypeScript Type safety
Tailwind CSS 4 Utility-first styling
TanStack React Query 5 Server state management & caching
Zustand 5 Client state management (auth, UI)
@microsoft/signalr Real-time WebSocket client
Sonner Toast notifications

Architecture Overview

┌─────────────────┐          ┌──────────────────────┐
│   Next.js 16    │  REST    │   ASP.NET Core 8     │
│   Frontend      │◄────────►│   Web API            │
│   (Port 3000)   │  HTTP    │   (Port 5155)        │
│                 │          │                      │
│  React Query    │ SignalR  │  EF Core 8           │
│  Zustand        │◄════════►│  Repository/UoW      │
│  SignalR Client │ WebSocket│  JWT Auth            │
└─────────────────┘          └──────────┬───────────┘
                                        │
                                        ▼
                              ┌──────────────────┐
                              │   PostgreSQL     │
                              │   (Neon Cloud)   │
                              └──────────────────┘
  • API Communication: REST endpoints (/api/*) for CRUD operations
  • Real-Time: SignalR hubs (/hubs/notifications, /hubs/appointments, /hubs/chat)
  • Auth: JWT tokens passed via Authorization: Bearer <token> header (REST) and access_token query param (SignalR)

Getting Started

Prerequisites

Backend Setup

cd Back/HealthFlow_backend

# Restore dependencies
dotnet restore

# Apply database migrations
dotnet ef database update --project HealthFlow_backend

# (Optional) Seed the database with sample data
dotnet run --project HealthFlow_backend -- seed

# Start the API server
dotnet run --project HealthFlow_backend

The API will be available at http://localhost:5155. Swagger UI is at http://localhost:5155/swagger.

Frontend Setup

cd frontend

# Install dependencies
npm install

# Create environment file
cp .env.example .env.local

# Start the dev server
npm run dev

The frontend will be available at http://localhost:3000.

Environment Variables

Backend — appsettings.json

Key Description
ConnectionStrings:DefaultConnection PostgreSQL connection string
Jwt:SecretKey Secret key for signing JWT tokens (min 32 chars)
Jwt:Issuer Token issuer (HealthFlow)
Jwt:Audience Token audience (HealthFlowClient)
Jwt:ExpirationMinutes Access token lifetime (default: 60)
Cors:AllowedOrigins Array of allowed frontend origins
FileStorage:UploadPath Directory for uploaded files (Uploads)

Frontend — .env.local

Key Description
NEXT_PUBLIC_API_URL Backend REST API base URL (e.g., http://localhost:5155/api)
NEXT_PUBLIC_WS_URL Backend SignalR hub base URL (e.g., http://localhost:5155/hubs)

Database

HealthFlow uses PostgreSQL with EF Core Code-First migrations. The schema includes:

Entity Description
User All users (patients, doctors, secretaries, admins) with role-based fields
Doctor Doctor profile (linked to User), specialization, clinic, bio, etc.
SecretaryProfile Secretary profile linked to one or more doctors via SecretaryDoctor
Appointment Patient ↔ Doctor appointment with status workflow
DoctorAvailability Weekly time-slot schedule for doctors
Clinic Clinic details with working hours and geolocation
Specialization Medical specializations (Cardiology, Neurology, etc.)
MedicalRecord Patient medical records created by doctors
ChatMessage Direct messages between doctors and secretaries
Notification In-app notifications for all users
FileUpload Uploaded file metadata (profile pictures, attachments)
DoctorRating Patient ratings/reviews for doctors

To seed the database with realistic sample data:

cd Back/HealthFlow_backend
dotnet run --project HealthFlow_backend -- seed

API Documentation

When the backend is running, visit Swagger UI at:

http://localhost:5155/swagger

Key Endpoint Groups

Route Prefix Controller Description
/api/auth AuthController Register, login, refresh token, forgot/reset password
/api/doctors DoctorsController Doctor profiles, search, availability, schedule, ratings
/api/appointments AppointmentsController CRUD, status transitions, patient/doctor views
/api/chat ChatController Contacts list, conversations, send messages, unread counts
/api/notifications NotificationsController List, mark read, unread count
/api/clinics ClinicsController CRUD for clinics
/api/specializations SpecializationsController CRUD for specializations
/api/medical-records MedicalRecordsController Create/view medical records
/api/files FilesController Upload/download/delete files
/api/admin AdminController Admin CRUD for users, doctors, secretaries, stats
/api/secretaries SecretariesController Secretary-specific operations

Project Structure

HealthFlow/
├── Back/HealthFlow_backend/          # .NET 8 Backend
│   └── HealthFlow_backend/
│       ├── Program.cs                # Application entry point & DI configuration
│       ├── Controllers/              # REST API controllers (11 controllers)
│       ├── Models/
│       │   ├── Entities/             # EF Core entity classes (14 entities)
│       │   └── Enums/                # UserRole, AppointmentStatus, etc.
│       ├── DTOs/                     # Data Transfer Objects per module
│       ├── Services/
│       │   ├── Interfaces/           # Service contracts (11 interfaces)
│       │   └── Implementations/      # Business logic (10 services)
│       ├── Repositories/
│       │   ├── Interfaces/           # Repository contracts + IUnitOfWork
│       │   └── Implementations/      # EF Core repositories + UnitOfWork
│       ├── Hubs/                     # SignalR hubs (Notification, Appointment, Chat)
│       ├── Data/                     # DbContext + DatabaseSeeder
│       ├── Configuration/            # JwtSettings, CorsSettings
│       ├── Middleware/               # Global exception handler
│       ├── Providers/                # SignalR UserIdProvider
│       └── Migrations/               # EF Core database migrations
│
├── frontend/                         # Next.js 16 Frontend
│   ├── app/                          # App Router pages & layouts
│   │   ├── layout.tsx                # Root layout
│   │   ├── providers.tsx             # Provider composition
│   │   ├── auth/                     # Login, Register, Forgot Password pages
│   │   ├── admin/                    # Admin panel (dashboard, users, doctors, etc.)
│   │   ├── doctor/                   # Doctor portal (dashboard, appointments, schedule, chat)
│   │   ├── secretary/                # Secretary portal (dashboard, appointments, chat)
│   │   └── patient/                  # Patient portal (dashboard, appointments, records)
│   ├── components/
│   │   ├── ui/                       # Reusable UI components (Button, Card, Badge, etc.)
│   │   ├── auth/                     # ProtectedRoute component
│   │   └── chat/                     # Shared ChatPage component
│   ├── hooks/
│   │   ├── use-auth.ts               # Auth hook (login, register, logout)
│   │   └── queries/                  # React Query hooks (appointments, chat, doctors, etc.)
│   ├── services/                     # API service layer (REST calls per module)
│   ├── lib/
│   │   ├── api/                      # HTTP client, endpoints config
│   │   └── signalr/                  # SignalR connection manager
│   ├── providers/                    # React providers (Auth, Query, Theme, Realtime, Toast)
│   ├── store/                        # Zustand stores (auth, UI)
│   └── types/                        # TypeScript type definitions
│
├── README.md                         # This file
└── ARCHITECTURE.md                   # Detailed architecture documentation

User Roles

Role Capabilities
Patient Browse doctors, book appointments, view medical records, manage profile
Doctor Manage schedule, view/manage appointments, create medical records, chat with secretaries
Secretary Manage appointments for assigned doctors, view patients, chat with assigned doctors
Admin Full system management — users, doctors, secretaries, clinics, specializations

Real-Time Features

HealthFlow uses SignalR for three real-time channels:

Hub Endpoint Purpose
NotificationHub /hubs/notifications Push notifications to users instantly
AppointmentHub /hubs/appointments Live appointment status updates
ChatHub /hubs/chat Doctor ↔ Secretary real-time messaging with room-based architecture

Chat Architecture

  • Sending: REST API POST /api/chat/send → saves to DB → pushes ReceiveMessage to receiver via SignalR
  • Rooms: JoinConversation / LeaveConversation for typing indicators and read receipts
  • Notifications: Push notification sent to receiver + in-app notification badge

License

This project is for educational and portfolio purposes.

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