env-sentinel 0.1.2

Validate environment variables at startup — fail fast with clear errors.

env-sentinel

Validate environment variables at startup — fail fast with clear errors.

Most apps read environment variables scattered throughout the codebase. When one is missing or mistyped, the failure surfaces at runtime — often deep in a request handler, minutes or hours after startup. env-sentinel moves that failure to the very beginning: call require() once at startup with your expected variables and types, and get a single, readable error listing every problem before your app ever handles traffic.

Install

pip install env-sentinel

Usage

from env_sentinel import require

config = require({
    "DATABASE_URL": str,
    "PORT": int,
    "DEBUG": bool,
    "THRESHOLD": float,
})

# config["PORT"] is already an int, config["DEBUG"] is already a bool

If anything is wrong, you get a single EnvironmentError listing all failures:

EnvironmentError: Environment validation failed:
  - PORT: missing
  - DEBUG: cannot convert 'maybe' to bool (accepted: true/1/yes or false/0/no)

Supported types

Type	Example env value	Python value
str	hello	"hello"
int	8080	8080
float	0.75	0.75
bool	true / 1 / yes	True
bool	false / 0 / no	False

Bool matching is case-insensitive.

License

MIT