In `Async-GraphQL` most common scalar types are built in, but you can also create your own scalar types.
Using `async-graphql::Scalar`, you can add support for a scalar when you implement it. You only need to implement parsing and output functions.
The following example defines a 64-bit integer scalar where its input and output are strings. (Note: `Async-graphQL` already supports 64-bit integers and uses strings as input and output.)