Glossary coding Term Page
env_prefix
Configuration prefix (such as APP_) that keeps different apps from colliding in the shared environment.
Core Idea
env_prefix is part of pydantic-settings. When set (for example APP_), Pydantic automatically prepends the prefix to each field name so your OS environment can hold configs for multiple services without collisions. secret_key becomes APP_SECRET_KEY, redis_url becomes APP_REDIS_URL, and so on.
Why It Matters Here
The Mathbong FastAPI guide uses env_prefix to separate tutorial apps deployed on the same machine. Combined with env_nested_delimiter, it encourages structured naming and prevents staging jobs from accidentally reading production secrets.