---
title: API Reference
description: Next.js API Reference for the App Router.
url: "https://nextjs.org/docs/15/app/api-reference"
version: 15.5.15
lastUpdated: 2025-06-16
---



- [Directives](/docs/15/app/api-reference/directives)
  - Directives are used to modify the behavior of your Next.js application.
- [Components](/docs/15/app/api-reference/components)
  - API Reference for Next.js built-in components.
- [File-system conventions](/docs/15/app/api-reference/file-conventions)
  - API Reference for Next.js file-system conventions.
- [Functions](/docs/15/app/api-reference/functions)
  - API Reference for Next.js Functions and Hooks.
- [Configuration](/docs/15/app/api-reference/config)
  - Learn how to configure Next.js applications.
- [CLI](/docs/15/app/api-reference/cli)
  - API Reference for the Next.js Command Line Interface (CLI) tools.
- [Edge Runtime](/docs/15/app/api-reference/edge)
  - API Reference for the Edge Runtime.
- [Turbopack](/docs/15/app/api-reference/turbopack)
  - Turbopack is an incremental bundler optimized for JavaScript and TypeScript, written in Rust, and built into Next.js.

---

For an index of all available documentation, see [/docs/15/llms.txt](/docs/15/llms.txt)