This page is for the current stable release of Schemars (v0.8.x).

To view this page for the v1 version of Schemars, which is still under development, click here.

Feature Flags and Optional Dependencies

• 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
• raw_value - implements JsonSchema for serde_json::value::RawValue (enables the serde_json raw_value feature)

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

• chrono - chrono (^0.4)
• indexmap1 - indexmap (^1.2)
• indexmap2 - indexmap (^2.0)
• either - either (^1.3)
• uuid08 - uuid (^0.8)
• uuid1 - uuid (^1.0)
• smallvec - smallvec (^1.0)
• arrayvec05 - arrayvec (^0.5)
• arrayvec07 - arrayvec (^0.7)
• url - url (^2.0)
• bytes - bytes (^1.0)
• enumset - enumset (^1.0)
• rust_decimal - rust_decimal (^1.0)
• bigdecimal03 - bigdecimal (^0.3)
• bigdecimal04 - bigdecimal (^0.4)
• smol_str - smol_str (^0.1.17)
• semver - semver (^1.0.9)

For example, to implement JsonSchema on types from chrono, enable it as a feature in the schemars dependency in your Cargo.toml like so:

[dependencies]
schemars = { version = "0.8", features = ["chrono"] }