# `preprocessors`

## Introduction

Preprocessors are similar to decorators, but they run before linting rather than after.

Refer to the [`decorator` configuration options](/docs/cli/configuration/reference/decorators) documentation for details; the options available are the same in both the `decorators` and `preprocessor` sections of the configuration file.

## Related options

- [decorators](/docs/cli/configuration/reference/decorators) offer some transformations for your OpenAPI documents.
- [plugins](/docs/cli/configuration/reference/plugins) allow code extensions to extend the existing functionality.


## Resources

- [Custom plugins](/docs/cli/custom-plugins) offer a way to extend the functionality of Redocly.