How do I install the Nextjs Authentication skill?

Run npx skillmds@latest add comeonoliver/nextjs-authentication in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

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Is Nextjs Authentication free to use?

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Who published Nextjs Authentication?

ComeOnOliver (@comeonoliver) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Nextjs Authentication by comeonoliver

Name: Nextjs Authentication
Rating: 4.2 (5 reviews)
Author: ComeOnOliver

Nextjs Authentication

Secure token storage (HttpOnly Cookies) and Middleware patterns. Use when implementing authentication, secure session storage, or auth middleware in Next.js. (triggers: middleware.ts, **/auth.ts, **/login/page.tsx, cookie, jwt, session, localstorage, auth)

ComeOnOliver Updated Sep 8, 2026 61 repo stars

File contents

Authentication & Token Management

Priority: P0 (CRITICAL)

Use HttpOnly Cookies for token storage. Never use LocalStorage or sessionStorage.

Implementation Guidelines

Token Storage: Strictly use HttpOnly, Secure cookies with SameSite: 'Lax' or 'Strict'. Set reasonable maxAge (e.g., 86400). Never store access tokens in localStorage or sessionStorage (XSS-vulnerable). LocalStorage causes hydration issues in Server Components.
Access Management: Read and verify tokens in Next.js Middleware (middleware.ts) for edge-side redirection and route protection. Use NextRequest to get cookies and NextResponse.redirect for unauthorized users. Use matcher in config for route protection.
Next.js 15+ Async: Remember that cookies() is a Promise from next/headers and must be awaited: const cookieStore = await cookies();. Access values via (await cookies()).get('token')?.value. Never pass raw token to Client Components.
Library Selection: Prefer next-auth (Auth.js) or Clerck for social logins and session management. Reach for getServerSession or auth() (Auth.js) to read an encrypted session.
Data Access: Always use a DAL (Data Access Layer) to validate credentials and verifies cookie presence before rendering.
CSRF Protection: Guard all Server Actions and Route Handlers by verifying the Origin/Referer headers.
User Verification: Use await auth() (from Auth.js) or a custom getSession() helper in Server Components. Always validate the session on the backend even if requested via Client Component.

References

Auth Implementation Examples

---name: nextjs-authenticationdescription: Secure token storage (HttpOnly Cookies) and Middleware patterns. Use when implementing authentication, secure session storage, or auth middleware in Next.js. (triggers: middleware.ts, **/auth.ts, **/login/page.tsx, cookie, jwt, session, localstorage, auth)---# Authentication & Token Management## **Priority: P0 (CRITICAL)**Use **HttpOnly Cookies** for token storage. **Never** use LocalStorage or sessionStorage.## Implementation Guidelines- **Token Storage**: **Strictly use `HttpOnly`, `Secure` cookies** with **`SameSite: 'Lax'`** or **`'Strict'`**. Set reasonable **`maxAge`** (e.g., 86400). **Never** store access tokens in **`localStorage`** or `sessionStorage` (**XSS-vulnerable**). LocalStorage causes **hydration issues** in Server Components.- **Access Management**: Read and verify tokens in **Next.js Middleware (`middleware.ts`)** for edge-side redirection and route protection. Use **`NextRequest`** to get cookies and **`NextResponse.redirect`** for unauthorized users. Use **`matcher`** in config for route protection.- **Next.js 15+ Async**: Remember that **`cookies()` is a Promise** from **`next/headers`** and must be awaited: **`const cookieStore = await cookies();`**. Access values via **`(await cookies()).get('token')?.value`**. **Never pass raw token** to Client Components.- **Library Selection**: Prefer **`next-auth` (Auth.js)** or **Clerck** for social logins and session management. Reach for **`getServerSession`** or **`auth()`** (Auth.js) to read an **encrypted session**.- **Data Access**: Always use a **`DAL`** (Data Access Layer) to **validate** credentials and **verifies** cookie presence before **rendering**.- **CSRF Protection**: Guard all **Server Actions** and **Route Handlers** by verifying the **Origin/Referer headers**.- **User Verification**: Use **`await auth()`** (from Auth.js) or a custom **`getSession()`** helper in **Server Components**. Always **validate the session on the backend** even if requested via Client Component.## References- [Auth Implementation Examples](references/auth-implementation.md)

Frequently asked questions