Next.js Developer Tools
Build and configure Next.js applications with our free browser-based tools. Visual route builders, matcher generators, and more.
App Router Path Builder
Visual builder for Next.js App Router routes including groups and parallel routes.
Middleware Matcher Builder
Build and test Next.js middleware config matcher patterns visually.
next.config Visualizer
Parse and explore next.config.js/ts options with descriptions and defaults.
Image Optimization Calculator
Calculate optimal image dimensions, sizes, and srcset for Next.js Image.
Route Handler Generator
Generate Next.js App Router API route boilerplate with type safety.
Why Use Next.js Tools?
Next.js is a powerful React framework, but its routing system, middleware configuration, and image optimization can be complex to set up correctly. Our Next.js developer tools help you build App Router paths with visual feedback, generate middleware matcher patterns, visualize configuration files, and calculate optimal image dimensions — all without leaving your browser. Whether you are new to Next.js or an experienced developer, these utilities save time and reduce configuration errors.
App Router Builder
Visually build Next.js App Router paths with dynamic segments, catch-all routes, and parallel routes. Generate the correct file structure and routing code.
Middleware Matcher Builder
Create and test middleware matcher patterns for Next.js middleware. Test which paths your middleware matches with real-time pattern validation.
Config Visualizer
Visualize and understand your Next.js configuration options. Explore available config properties, their types, and how they affect your application build and runtime.
Image Calculator
Calculate optimal image dimensions and formats for Next.js Image component. Compute responsive image sizes based on layout, device sizes, and breakpoints.
Next.js Best Practices
Use the App Router for New Projects
The App Router is the recommended routing solution for new Next.js projects. It supports React Server Components, streaming, and nested layouts.
Leverage Middleware for Authentication
Use Next.js middleware for authentication checks, redirects, and header rewrites. Test your matcher patterns with our matcher builder to ensure correct coverage.
Optimize Images with Next.js Image
Use the Next.js Image component for automatic image optimization, lazy loading, and responsive sizing. Calculate optimal dimensions with our image calculator for the best performance.
Understand File Conventions
Next.js uses file conventions (page.tsx, layout.tsx, loading.tsx, error.tsx) for routing. Our App Router builder helps you create the correct file structure.
Frequently Asked Questions
Are these Next.js tools free?
Yes, all Next.js developer tools are completely free with no usage limits or sign-up required.
Do I need to install Next.js to use these tools?
No. Our Next.js utilities run entirely in your browser and help you plan and generate code before writing it in your project.
Are the tools compatible with Next.js 15+?
Yes, our tools support the latest Next.js App Router conventions, Middleware API, and Image component features.