Javascript Anchor Types Reference

This reference shows you how Anchor maps Rust types to JavaScript/TypeScript types in the client.

Type	Rust	TypeScript	Example
Boolean	`bool`	`boolean`	`true`
Integer	`u8/u16/u32/i8/i16/i32`	`number`	`99`
Big integer	`u64/u128/i64/i128`	`anchor.BN`	`new anchor.BN(99)`
Float	`f32/f64`	`number`	`1.0`
String	`String`	`string`	`"hello"`
Array	`[T; N]`	`Array<T>`	`[1, 2, 3]`
Vector	`Vec<T>`	`Array<T>`	`[1, 2, 3]`
Option	`Option<T>`	`T \| null \| undefined`	`None`: `null` `Some(val)`: `42`
Struct	`Struct`	`object`	`struct MyStruct { val: u16, }` `{ val: 99 }`
Enum	`Enum`	`object`	`enum MyEnum { One, Two { val: u32 }, Three(u8, i16), }` Unit variant: `{ one : {} }` Named variant: `{ two: { val: 99 } }` Unnamed (tuple) variant: `{ three: [12, -34] }`

Boolean