Contentlayer is a content preprocessor that validates and transforms your content into type-safe JSON, which you can easily import into your application. It provides a seamless abstraction between your Markdown files or CMS and your application, allowing you to import and manipulate your content as data directly with JavaScript or TypeScript methods. This eliminates the need to learn new query languages or navigate complex APIs. Contentlayer ensures that your data is properly structured across your application by automatically generating type definitions and configurable data validations. It supports integration with various site frameworks and content sources, including MDX, Notion, and Sanity. By facilitating incremental and parallel builds, instant content live-reload, and scalability to handle thousands of documents, Contentlayer enhances both developer experience and application performance.