Free course · 4 lessons · Beginner
Flask API Fundamentals
Build lightweight Python APIs with Flask routing, request handling, JSON responses, and blueprints.
1. Flask Basics
Start with the smallest useful Flask API.
- Create Your First API — Build a tiny JSON endpoint and understand the app object.
- Routes, Requests, and JSON — Read path, query string and JSON input in Flask, validate it before doing any work, and return the right status code.
2. Structure and Error Handling
Keep larger Flask APIs maintainable with blueprints and consistent errors.
- Blueprints for API Modules — Split a growing Flask API into blueprints, register them in an app factory with URL prefixes, and avoid circular imports.
- Error Responses That Help — Return consistent JSON errors from Flask with one error shape, HTTPException and custom handlers, and the right status codes.