#derive Clear
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Rust Serde — Derive Serialize / Deserialize
`#[derive(Serialize, Deserialize)]` is the one-liner that bridges Rust structs and JSON / YAML / TOML / etc. via serde's data-format crates.
Rust clap — Derive-Style CLI Parser
`clap` with the derive macro turns a Rust struct into a fully-featured CLI: `--help`, `--version`, validation, subcommands. The most popular CLI framework in the Rust ecosystem.