# Nextjs Core

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

- Skill: `bobmatnyc/nextjs-core` (Agent Skill, multi-file: 8 files)
- Install (CLI): `npx skillmds@latest add bobmatnyc/nextjs-core`
- Raw SKILL.md: https://api.skillmd.com/api/skills/bobmatnyc/nextjs-core/raw
- Safety review: PASS (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Web & Frontend
- Author: bobmatnyc (https://skillmd.com/u/bobmatnyc)
- Updated: 2026-08-19
- Page: https://skillmd.com/skills/bobmatnyc/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).