# Nextjs Core

> Core Next.js patterns for App Router development including Server Components, Server Actions, route handlers, data fetching, and caching strategies

- Skill: `majiayu000/nextjs-core` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds add majiayu000/nextjs-core`
- Raw SKILL.md: https://api.skillmd.com/api/skills/majiayu000/nextjs-core/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Web & Frontend
- Author: majiayu000 (https://skillmd.com/u/majiayu000)
- Updated: 2026-09-09
- Page: https://skillmd.com/skills/majiayu000/nextjs-core

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# Next.js Core (App Router)

- Server Components by default; minimal `"use client"`.
- Mutations in Server Actions (validate/authz; revalidate tags/paths).
- Route handlers for APIs/webhooks; add loading/error boundaries.

Anti-patterns:
- ❌ Fetch initial data in `useEffect`.
- ❌ Cache or revalidate too broadly.
- ❌ Client-only authz.

References: see `references/` (server actions, fetching, caching, routing, auth, testing).