A Rust library for deserializing environment variables into type-safe structs using Serde.
Envy is a Rust crate that simplifies configuration management by automatically deserializing environment variables into strongly-typed Rust structs. It leverages Serde's deserialization framework to provide a safe and ergonomic way to handle application configuration from the environment, preventing runtime errors through compile-time type checking.
Rust developers building applications that require configuration via environment variables, particularly those using the Serde ecosystem for serialization and deserialization.
Developers choose Envy for its seamless integration with Serde, offering type safety and flexibility with features like optional fields, vector support, and prefixed variables, all while adhering to Rust's philosophy of safety and explicitness.
deserialize env vars into typesafe structs with rust
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Envy deserializes environment variables into Rust structs with compile-time validation, preventing runtime errors as shown in examples where mismatched types cause deserialization failures.
Built on Serde, it supports all Serde attributes for custom deserialization, such as using #[serde(default="function")] to specify defaults, enhancing flexibility.
Automatically manages missing env vars for Option types and parses comma-separated values into Vec, simplifying common configuration patterns without extra code.
Provides envy::prefixed(prefix) to namespace env vars, avoiding conflicts in multi-service apps as demonstrated with the APP_ prefix example.
Only deserializes from environment variables, so projects needing mixed sources like files or command-line arguments must integrate additional crates.
Configuration is loaded once at startup; Envy doesn't support hot-reloading of environment variables without manual reinitialization or external tools.
Heavy reliance on Serde adds compile-time complexity and requires familiarity with Serde's attributes for advanced customization, which can be a barrier.