nextjs

A set of coding guidelines for Next.js, a framework for building web applications with React, TypeScript and Tailwind CSS. It covers project folders, components, performance and fetching data.

In plain words
What is it for?
Use it when creating or reviewing Next.js files, especially app routes, shared components, server or client components, images, loading states and data fetching.
Why use it?
It gives the coding agent consistent choices for organizing a Next.js project and handling common performance and data-loading concerns.

Cursor rule

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add rules/toptalentcoder/cursor-awesomerules/nextjs
Clone the repo
git clone --depth 1 https://github.com/toptalentcoder/Cursor-AwesomeRules
Per session 355 This file is loaded in full into every session.
When invoked 355 The same file — it is already loaded in full.
Security scan A 0 findings. Scan, not verified.
Origin 94% copy Near-identical to another mod in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00355 $0.00355
Opus 5 $0.00178 $0.00178
Sonnet 5 $0.00071 $0.00071
Haiku 4.5 $0.00036 $0.00036

Measured 2d ago against content hash 6c334dcee137, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

nextjs scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

This is a copy

94% identical to nextjs — 8 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

rules-new/nextjs.mdc · 52 lines

What it actually says


description: Next.js with TypeScript and Tailwind UI best practices globs: /.tsx, **/.ts, src//.ts, src/**/.tsx

Next.js Best Practices

Project Structure

  • Use the App Router directory structure
  • Place components in app directory for route-specific components
  • Place shared components in components directory
  • Place utilities and helpers in lib directory
  • Use lowercase with dashes for directories (e.g., components/auth-wizard)

Components

  • Use Server Components by default
  • Mark client components explicitly with 'use client'
  • Wrap client components in Suspense with fallback
  • Use dynamic loading for non-critical components
  • Implement proper error boundaries
  • Place static content and interfaces at file end

Performance

  • Optimize images: Use WebP format, size data, lazy loading
  • Minimize use of 'useEffect' and 'setState'
  • Favor Server Components (RSC) where possible
  • Use dynamic loading for non-critical components
  • Implement proper caching strategies

Data Fetching

  • Use Server Components for data fetching when possible
  • Implement proper error handling for data fetching
  • Use appropriate caching strategies
  • Handle loading and error states appropriately

Routing

  • Use the App Router conventions
  • Implement proper loading and error states for routes
  • Use dynamic routes appropriately
  • Handle parallel routes when needed

Forms and Validation

  • Use Zod for form validation
  • Implement proper server-side validation
  • Handle form errors appropriately
  • Show loading states during form submission

State Management

  • Minimize client-side state
  • Use React Context sparingly
  • Prefer server state when possible
  • Implement proper loading states
Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2d ago First seen · 52 lines · 355 tokens per session scan A 6c334dcee137

Subscribe to this mod's changes

nextjs is a cursor rule published in the GitHub repository toptalentcoder/Cursor-AwesomeRules (6 stars, last pushed 1y ago), licensed CC0-1.0. It adds 355 tokens to every session, about $0.0018 per session on Opus 5. A static security scan graded it A with 0 findings. It is 94% identical to nextjs, differing in 8 lines, and is treated as a copy.