# Use composable-functions with a custom parser

This simple example can be a reference to adapt composable-functions to any other parser library.

There are two approaches to use composable-functions with a custom parser:
- Create an adapter function that will receive a schema and return a schema in the shape of a `ParserSchena`. Example: [the `adapt` function](./src/adapters.ts). This is our preferred approach and we wrote a [post about it](https://dev.to/seasonedcc/using-arktype-in-place-of-zod-how-to-adapt-parsers-3bd5).
- Create your custom `applySchema` that will validate your input and context and return a `Result`. Example: [the `applyArkSchema` function](./src/adapters.ts).

Check out the [`./src`](./src/) directory to understand how we implemented both approaches with [`arktype`](https://github.com/arktypeio/arktype).