Building a RAG API with FastAPI and a Vector Database: Step by Step

Posted on Fri 13 November 2026 in Tutorial • Tagged with GenAI, RAG, FastAPI, vector-database, Python, API, ChromaDB, production

What We're Building

Retrieval-Augmented Generation (RAG) is the pattern where an LLM answers questions using documents you provide, rather than relying only on what it learned during training. It's the foundation of most real-world AI apps: document Q&A, support bots, knowledge assistants.

This post builds a working RAG API …


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