schemars/docs/4-features.md

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default	Feature Flags	5	/features/

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"] }

Feature Flags

• derive (enabled by default) - provides #[derive(JsonSchema)] macro
• impl_json_schema - implements JsonSchema for Schemars types themselves

Optional Dependencies

Schemars can implement JsonSchema on types from several popular crates, enabled via optional dependencies (dependency versions are shown in brackets):

• chrono (^0.4)
• indexmap (^1.2)
• either (^1.3)
• uuid (^0.8)
• smallvec (^1.0)
• arrayvec (^0.5)