Type Mappings

Complete reference for Rust → target language type mappings.

Primitive Types

Rust Type	TypeScript	Python	Go	Swift	Kotlin	GraphQL	JSON Schema
`String`	`string`	`str`	`string`	`String`	`String`	`String`	`string`
`bool`	`boolean`	`bool`	`bool`	`Bool`	`Boolean`	`Boolean`	`boolean`
`u8`	`number`	`int`	`uint8`	`UInt8`	`UByte`	`Int`	`integer`
`u16`	`number`	`int`	`uint16`	`UInt16`	`UShort`	`Int`	`integer`
`u32`	`number`	`int`	`uint32`	`UInt32`	`UInt`	`Int`	`integer`
`u64`	`bigint`	`int`	`uint64`	`UInt64`	`ULong`	`String`	`integer`
`i8`	`number`	`int`	`int8`	`Int8`	`Byte`	`Int`	`integer`
`i16`	`number`	`int`	`int16`	`Int16`	`Short`	`Int`	`integer`
`i32`	`number`	`int`	`int32`	`Int32`	`Int`	`Int`	`integer`
`i64`	`bigint`	`int`	`int64`	`Int64`	`Long`	`String`	`integer`
`f32`	`number`	`float`	`float32`	`Float`	`Float`	`Float`	`number`
`f64`	`number`	`float`	`float64`	`Double`	`Double`	`Float`	`number`

Special Types

Rust Type	TypeScript	Python	Go	Swift	Kotlin	GraphQL	JSON Schema
`Uuid`	`string`	`UUID`	`string`	`UUID`	`String`	`ID`	`string` (uuid)
`DateTime<Utc>`	`string`	`datetime`	`time.Time`	`Date`	`Instant`	`DateTime`	`string` (date-time)
`NaiveDate`	`string`	`date`	N/A	N/A	N/A	N/A	`string` (date)
`serde_json::Value`	`unknown`	`Any`	`interface{}`	`Any`	`JsonElement`	`JSON`	`{}`

Container Types

Rust Type	TypeScript	Python	Go	Swift	Kotlin	GraphQL	JSON Schema
`Option<T>`	`T \| undefined`	`Optional[T] = None`	`*T` (omitempty)	`T?`	`T? = null`	Nullable	Not in `required`
`Vec<T>`	`T[]`	`list[T]`	`[]T`	`[T]`	`List<T>`	`[T!]`	`array`
`HashMap<K,V>`	`Record<K, V>`	`dict[K, V]`	`map[K]V`	`[K: V]`	`Map<K, V>`	`JSON`	`object`
`(A, B, ...)`	N/A	`Tuple[A, B, ...]`	N/A	N/A	N/A	N/A	`prefixItems`

Custom Types

Custom structs and enums are referenced by name in all languages.