Javascript Anchor Types Reference

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

Rust Type	JavaScript Type	Example	Note
`bool`	`boolean`	`await program .methods .init(true) .rpc();`
`u64/u128/i64/i128`	`anchor.BN`	`await program .methods .init(new anchor.BN(99)) .rpc();`	https://github.com/indutny/bn.js
`u8/u16/u32/i8/i16/i32`	`number`	`await program .methods .init(99) .rpc();`
`f32/f64`	`number`	`await program .methods .init(1.0) .rpc();`
`Enum`	`object`	`enum MyEnum { One, Two { val: u32 }, Three(u8, i16), };` `// Unit variant await program .methods .init({ one: {} }) .rpc(); // Named variant await program .methods .init({ two: { val: 99 } }) .rpc(); // Unnamed (tuple) variant await program .methods .init({ three: [12, -34] }) .rpc();`
`Struct`	`{ val: {} }`	`struct MyStruct { val: u16, }` `await program .methods .init({ val: 99 }) .rpc();`
`[T; N]`	`Array<T>`	`await program .methods .init([1, 2, 3]) .rpc();`
`String`	`string`	`await program .methods .init("hello") .rpc();`
`Vec<T>`	`Array<T>`	`await program .methods .init([1, 2, 3]) .rpc();`
`Option<T>`	`T \| null \| undefined`	// `null` for `None` await program .methods .init(null) .rpc(); // Non-nullish value for `Option<T>` await program .methods .init(42) .rpc();