FastOpp Country Store 1.9 – Connect FastOpp to an LLM with a FastAPI Service

FastOpp Country Store ends on a high note in this ninth lesson, where you connect your app to a real Large Language Model (LLM) through a FastAPI service. This is where your project gains an AI-powered feature that can use your existing data to deliver smart responses.

Connect to OpenRouter LLM using FastAPI service. Generates description from product name.

design prompt to send to LLM
call LLM service in FastOpp
extract description from response
strip markdown formatting
strip results of other characters that might mangle formatting

The LLM service returns both a response and a "raw_response". We take the raw_response and use mdclense to strip out the markdown formatting

In this video, you will:
-- Set up a FastAPI service endpoint that talks to an LLM via the OpenRouter API
-- Pass data from your Country Store (or other app context) into prompts safely and cleanly
-- Structure request and response models so your LLM integration stays typed and maintainable
-- Configure API keys and environment variables so credentials stay out of your codebase
-- Handle errors and timeouts so your app fails gracefully when the LLM is slow or unavailable

This video is part 9 of 9 in the *“FastOpp Beginner – Country Store”* course, which takes you from a simple starter template to a styled, database-backed FastAPI app with an AI-powered feature using the OpenRouter API.

Course overview:

This course walks through building and extending a small “Country Store” web app using FastOpp, a project that includes FastAPI, SQLModel, and modern web tools.

Starting from a simple template, the course teaches how to wire together Jinja2 templates, SQLModel data models, and FastAPI routes, then progressively add styling, static assets, database administration, schema migrations, and finally an LLM-powered feature using OpenRouter API.

Watch the full course here:
   • FastOpp Country Store – Module 1: Beginner...  

GitHub repo (FastOpp code):
https://github.com/Oppkey/fastopp

Who this is for:
-- Python developers who want a practical example of connecting FastAPI to an LLM API
-- FastAPI and SQLModel users ready to add AI features on top of an existing web app
-- Anyone looking for a clear, minimal pattern for integrating OpenRouter (or similar LLM providers) into production-style services

By the end of this lesson, your Country Store app will have a working LLM integration, giving you a concrete, reusable blueprint for adding AI-powered features to your own FastAPI projects.

#fastapi #python #llm #openrouter #sqlmodel #ai #webdevelopment #fastoppproject