🛣️ nextjs-paths

Type-safe path utilities for Next.js App Router

Generate strongly typed path utilities from your Next.js App Router. This package automatically generates a paths.ts file that provides type-safe access to ALL your application's routes.

✨ Features

• 🔍 Automatic Scanning - Scans your Next.js App Router structure
• 📝 Type Safety - Full TypeScript support with generated types
• 🛣️ Route Support - Handles dynamic routes and route groups
• 🚀 HTTP Methods - Includes GET, POST, PUT, DELETE handlers
• 🎯 URL Utilities - Path, URL, and URL constructor utilities
• 🔒 Type Safety - Type-safe route parameters and query strings
• 🎨 Naming - Supports both camelCase and snake_case
• 📦 Zero Dependencies - No runtime dependencies
• ⚡️ Performance - Fast and efficient path generation
• 🎭 Declarative - Write routes in a natural, declarative way

📦 Installation

Using npm

# Or install globally
npm install -g nextjs-paths

Using yarn

# Or install globally
yarn global add nextjs-paths

Using pnpm

# Or install globally
pnpm add -g nextjs-paths

🚀 Usage

1. Install the package

npm install nextjs-paths

2. Generate paths

Add a script to your package.json:

{
  "scripts": {
    "generate:paths": "nextjs-paths generate"
  }
}

Then run:

npm run generate:paths

Or run directly:

npx nextjs-paths generate

3. Use in your code

Declarative Navigation

import { paths } from "./paths";

// Simple navigation
export default function Navigation() {
  return (
    <nav>
      <Link href={paths.blog.GET.path}>Blog</Link>
      <Link href={paths.about.GET.path}>About</Link>
    </nav>
  );
}

// Dynamic routes
export function BlogPost({ slug }: { slug: string }) {
  return <Link href={paths.blog.slug(slug).path}>Read Post</Link>;
}

// API calls
async function fetchBlogPost(slug: string) {
  const response = await fetch(paths.blog.slug(slug).url);
  return response.json();
}

// Form submissions
async function handleSubmit(data: FormData) {
  await fetch(paths.blog.POST.url, {
    method: "POST",
    body: data,
  });
}

Type-Safe Route Parameters

// TypeScript will ensure you provide all required parameters
const post = paths.blog.slug("2024/my-post");
const comment = paths.blog.slug("2024/my-post").comment("123");

// TypeScript error if you forget a parameter
const invalidPost = paths.blog.slug(); // Error: Missing required parameter

URL Construction

// Build URLs with query parameters
const blogWithFilters = paths.blog.GET.URL();
blogWithFilters.searchParams.set("category", "tech");
blogWithFilters.searchParams.set("sort", "newest");

// Use in API calls
const response = await fetch(blogWithFilters.toString());

CLI Options

Option	Description	Default
-d, --appDir <dir>	App router root directory	src/app
-e, --env <var>	Environment variable for base URL	NEXT_PUBLIC_APP_BASE_URL
-c, --caseStyle <style>	Case style for path keys	camelCase
-o, --outputDir <dir>	Output directory for generated files	Same as appDir
-f, --fileName <name>	Output file name (must end with .ts)	paths.ts

Case Styles

The following case styles are supported:

• camelCase (default): blogPost, userProfile
• lowerSnake: blog_post, user_profile
• upperSnake: BLOG_POST, USER_PROFILE
• pascalCase: BlogPost, UserProfile

📝 Example

Given a Next.js app structure:

app/
  ├── page.tsx
  ├── about/
  │   └── page.tsx
  ├── blog/
  │   ├── page.tsx
  │   ├── [[...slug]]/
  │   │   └── page.tsx
  │   └── route.ts
  └── api/
      └── hello/
          └── route.ts

The generated paths.ts provides type-safe access:

import { paths } from "./paths";

// Basic paths
paths.path; // "/"
paths.url; // "http://localhost:3000"
paths.URL(); // TS/JS URL class object

// Blog routes
paths.blog.GET.path; // "/blog"
paths.blog.GET.url; // "http://localhost:3000/blog"
paths.blog.GET.URL().toString(); // "http://localhost:3000/blog"

// Dynamic routes
const blogPost = paths.blog.slug("2024/my-post");
blogPost.path; // "/blog/2024/my-post"
blogPost.url; // "http://localhost:3000/blog/2024/my-post"

// Route handlers
paths.blog.GET.path; // "/blog"
paths.blog.POST.path; // "/blog"
paths.blog.PUT.path; // "/blog"

// URL with query params
const blogWithDraft = paths.blog.GET.URL();
blogWithDraft.searchParams.set("draft", "1");
blogWithDraft.toString(); // "http://localhost:3000/blog?draft=1"

⚙️ Configuration

Base URL

# Use custom environment variable
npx nextjs-paths generate --env NEXT_PUBLIC_SITE_URL

Output Directory and File Name

# Generate files in custom directory with custom name
npx nextjs-paths generate --outputDir ./generated --fileName routes.ts

Case Style

# Use different case styles
npx nextjs-paths generate --caseStyle lowerSnake  # blog_post
npx nextjs-paths generate --caseStyle upperSnake  # BLOG_POST
npx nextjs-paths generate --caseStyle pascalCase  # BlogPost
npx nextjs-paths generate --caseStyle camelCase   # blogPost (default)

App Directory

# Generate from custom app directory
npx nextjs-paths generate --appDir ./app

🛠️ Development

# Install dependencies
npm install

# Build the package
npm run build

# Run tests
npm test

# Generate test paths
npm run generate:test

🤝 Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

1. Fork the repository
2. Create your feature branch (git checkout -b feature/amazing-feature)
3. Commit your changes (git commit -m 'Add some amazing feature')
4. Push to the branch (git push origin feature/amazing-feature)
5. Open a Pull Request

📄 License

MIT