Express TypeScript API with PostgreSQL

A simple Express.js API built with TypeScript and PostgreSQL database support.

Prerequisites

• Node.js (v18 or higher)
• Docker and Docker Compose
• npm or yarn

Setup Instructions

1. Install Dependencies

npm install

2. Start PostgreSQL Database

Start the PostgreSQL database using Docker Compose:

docker compose up -d

This will start:

• PostgreSQL database on port 5432

3. Environment Variables

The .env file is already configured with default values:

• Database: os_assignment_db
• Username: postgres
• Password: password123
• Host: localhost
• Port: 5432

4. Run the Application

Development mode (with hot reload):

npm run dev

Production mode:

npm run build
npm start

Available Endpoints

API Endpoints

• GET /health/db - Database connection health check
• GET /users - Get all users
• POST /users - Create a new user (requires name and email in request body)

Database Schema

The database is automatically initialized with a users table:

CREATE TABLE users (
    id SERIAL PRIMARY KEY,
    name VARCHAR(100) NOT NULL,
    email VARCHAR(100) UNIQUE NOT NULL,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

Example API Calls

Get all users

curl http://localhost:3000/users

Create a new user

curl -X POST http://localhost:3000/users \
  -H "Content-Type: application/json" \
  -d '{"name": "John Doe", "email": "john@example.com"}'

Check database health

curl http://localhost:3000/health/db

Docker Commands

Start the database:

docker-compose up -d

Stop the database:

docker-compose down

View logs:

docker-compose logs postgres

Connect to PostgreSQL directly:

docker exec -it os-assignment-postgres psql -U postgres -d os_assignment_db