FastAPI:SettingsAndEnvironmentVariables
lastmod 2026-11-10created 2023-07-162 edits
In FastAPI, the recommended way to manage settings and environment variables is with a class that inherits from Pydantic's BaseSettings. Declaring settings and their types as class fields makes it read values from environment variables and .env files and validate and convert them automatically, and combining dependency injection with lru_cache lets you create the settings object only once, reuse it, and easily swap it out in tests.