Free Course — No signup required

Build APIs with Flask
in 5 Days

Flask is a lightweight Python web framework that gives you just what you need — no more, no less. Perfect for APIs and microservices.

5 lessons
Self-paced
~60 min/day
Free forever
Start Day 1 — Free → See what's covered
What you'll learn

Flask in 5 Days

Flask is a lightweight Python web framework that gives you just what you need — no more, no less. Perfect for APIs and microservices.

  • Define routes and handle HTTP methods
  • Render templates with Jinja2
  • Connect to a database with SQLAlchemy
  • Add user authentication with Flask-Login
  • Deploy Flask to Render or Railway
5
practical lessons
Micro
framework, big power
$0
cost to take this course
REST
API-ready from day 1
5-Day Curriculum

Every lesson ships working code.
No theory without practice.

01
Routes, Views, and Jinja2 Templates
Install Flask, define your first routes, return HTML templates with Jinja2, and understand request/response objects.
@app.routerender_templaterequestJinja2
→
02
SQLAlchemy and Databases
Connect Flask to SQLite/PostgreSQL via SQLAlchemy. Define models, run migrations with Flask-Migrate, and perform CRUD.
SQLAlchemymodelsdb.sessionFlask-Migrate
→
03
Forms and Validation
Build HTML forms, validate input with WTForms, handle file uploads, and show flash messages.
WTFormsCSRFfile uploadflash()
→
04
Authentication
Add user registration, login, and logout with Flask-Login. Hash passwords with bcrypt and protect routes with @login_required.
Flask-Loginbcryptsession@login_required
→
05
REST API and Deploy
Build a JSON API with proper status codes, add CORS, and deploy to Render with a production WSGI server (gunicorn).
jsonifyCORSgunicornRender
→
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Your instructor
B
Bo Peng
Founder, Precision AI Academy

Kaggle Top 200 data scientist. Trained 400+ professionals across universities and federal agencies. Built production systems used by thousands. This course skips toy examples and gives you patterns that work in real projects.

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