schemars/docs/4-features.md

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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
• preserve_order - keep the order of struct fields in Schema and SchemaObject

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)