schemars/docs/4-features.md

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default	Feature Flags	5

Feature Flags and Optional Dependencies

Some functionality can be selectively enabled/disabled via Cargo features. These can be enabled when you add Schemars to your crate's cargo.toml, e.g.

[dependencies]
schemars = { version = "0.6", features = ["chrono"] }

derive_json_schema

Implements JsonSchema on Schemars types themselves.

chrono

Implements JsonSchema on all Chrono types which are serializable by Serde.