---
name: nextjs-upgrade-e1c201a963b0
description: Next.js version migrations using official guides and codemods. Use when migrating a Next.js project to a new major version using codemods.
metadata:
  triggers:
    files:
    - 'package.json'
    keywords:
    - next upgrade
    - migration guide
    - codemod
---
# Next.js Upgrade Protocol

Automated and manual migration steps for Next.js version upgrades (e.g., v14 to v15).

## **Priority: P1 (HIGH)**

## Workflow: Upgrade Next.js to New Major Version

1. Check current versions of `next`, `react`, `react-dom` in `package.json`
2. Plan incremental path (e.g., v13 -> v14 -> v15; never skip majors)
3. Run codemods: `npx @next/codemod@latest <transform> <path>`
4. Update dependencies:
 See [implementation examples](references/example.md)
5. Verify async APIs: ensure `cookies()`, `headers()`, `params` awaited (v15+)
6. Audit `fetch` caching: v15 defaults to `no-store`; add `force-cache` where needed
7. Run `next build` and fix hydration or Turbopack errors
8. Report codemod failures or manual fixes to team

## Implementation Guidelines

- **Upgrade Detection**: Always check `package.json` for versions of `next`, `react`, and `react-dom`.
- **Planning**: For major version jumps (v13 to v15), perform incremental upgrade (v13 -> v14, then v14 -> v15). Follow official Next.js Migration Guides.
- **Automated Codemods**: Use `npx @next/codemod@latest <transform> <path>` to automate syntax migration.
- **Breaking Changes (v15)**: Respond to `next-async-request-api` transform by ensuring `params`, `searchParams`, `cookies()`, and `headers()` awaited.
- **React Parity**: Upgrade `react` and `react-dom` to match Next.js peer dependencies (e.g., React 19 for Next.js 15).
- **Validation**: Run `next dev` and `next build` after each incremental step. Check console errors for hydration warnings.

## Anti-Patterns

- **No major version skipping**: Upgrade one major version at time (13 -> 14, then 14 -> 15).
- **No manual breaking-change fixes**: Always run `npx @next/codemod@latest` transforms first.
- **No assumed caching behavior post-upgrade**: v15 defaults to `no-store`; audit all `fetch` calls.
- **No async page functions in Pages Router**: `export default async function Page()` fatal.

## Canonical response anchors

When this skill applies, preserve the following domain terminology or equivalent concrete examples in the answer when relevant:
- incremental
- one major


---
Source attribution: HoangNguyen0403
Original project: https://github.com/HoangNguyen0403/agent-skills-standard
License: MIT
License information: https://opensource.org/license/mit
Original upstream instructions; downloaded from Mega AI Hub.

## Upstream license notice

MIT License

Copyright (c) 2026 Gabriel Moreira

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.



# Mega AI Hub resource metadata

Creator / publisher: HoangNguyen0403
Original project: https://github.com/HoangNguyen0403/agent-skills-standard
Attribution basis: Upstream repository explicitly recorded in package mirror path

Fields of work: Development & Engineering
Roles: Backend Developer, Frontend Developer, Full-Stack Developer
Specialties: Backend, Cross Platform, Frontend
Tools: Nextjs
Country applicability: Country not specified
Classification basis: Source catalog labels
Instruction SHA-256: b2fb8e91aca8e924d81d1fe4320e04b8d991d5f44fec9b315119f54f358a6b5b