environs

Typed environment variable resolution with fallback key chains and dotenv loading.

Built because every env config crate is either too magic or too verbose.

use environs::env;

let port: u16 = env!("APP_PORT", "PORT", default = 8080)?;
let db: String = env!("DATABASE_URL")?;
let debug: Option<bool> = env!("DEBUG")?;

Dotenv loading checks DOTENV_PATH or falls back to .env:

environs::load()?;

Errors include the source file and line where env!() was called.

cargo add environs