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Introduction

Ever wondered what actually goes into building a real backend API, not a toy example, but something with a database, real endpoints, and proper structure?

I did too. So I built one.

This is a breakdown of how I built a Rental Listings REST API using FastAPI and PostgreSQL as part of my developer roadmap and what I learned along the way.

Prerequisites

Basic Python knowledge

Python 3.10+ installed

PostgreSQL installed and running

Familiarity with the terminal

What You'll Learn

How to set up a FastAPI project from scratch

How to define database models with SQLAlchemy

How to connect FastAPI to PostgreSQL

How to build full CRUD endpoints

How to test your API using Swagger UI

Why FastAPI?

Think of FastAPI like a very efficient waiter at a restaurant.

You place an order (send a request), the waiter takes it to the kitchen (your logic), and brings back exactly what you asked for, fast, no confusion.

FastAPI handles all the routing, validation, and…