Python FastAPI Tutorial (Part 2): HTML Frontend for Your API - Jinja2 Templates

FastAPI supports HTML templating through Jinja2, allowing you to serve web pages alongside JSON API endpoints. Set up a templates directory, configure Jinja2Templates, and use template responses with context dictionaries to pass data. Jinja2 syntax includes for loops ({% for %}), conditionals ({% if %}), and variable display ({{ }}). Template inheritance with a base layout.html eliminates code duplication across pages. Mount a static files directory to serve CSS, JavaScript, and images. Use url_for() to generate URLs dynamically for routes and static assets. This approach maintains separation between human-facing HTML pages and machine-readable API endpoints while sharing the same backend data.