schemars/docs/examples/7-custom_serialization.md

layout	title	parent	nav_order	summary
default	Custom Serialization	Examples	7	If a field has a #[serde(with = "path")] attribute where "path" is not a type that implements JsonSchema, then in order to derive JsonSchema on the type, it must also have a #[schemars(with = "Type")] attribute, where "Type" implements JsonSchema.

Deriving JsonSchema with Fields Using Custom Serialization

Serde allows you to change how a field is (de)serialized by setting a #[serde(with = "path")] attribute, where $path::serialize and $path::deserialize must be functions with the correct signature. Schemars supports the same attribute, but path must be a type implementing JsonSchema.

In order to derive JsonSchema on a type which includes a #[serde(with = "path")] attribute where path is not a type implementing JsonSchema, you'll need to override it with a suitable #[schemars(with = "Type")] or #[schemars(schema_with = "path")] attribute.

{% include example.md name="custom_serialization" %}

Note that the default values in the schema are serialized as strings where appropriate.