Middleware Matcher Builder helps you configure and build Next.js apps quickly and accurately, right in your browser. Whether you need to build and test next.js middleware config matcher patterns visually, this tool eliminatesconfiguration errors, routing issues, and optimization gaps by giving you instant, reliable results. Every operation runs locally on your device — nothing is uploaded to any server, so your data stays completely private.
Key Features
Pattern Builder
Build matcher patterns with visual toggles for paths, params, and conditions.
Live Testing
Test URLs against your matcher patterns and see match/no-match results.
Regex Preview
See the compiled regex from your matcher patterns.
Config Export
Export the complete matcher configuration ready for middleware.ts.
Common Use Cases
- Build and test matcher patterns for authentication middleware
- Exclude static assets and API routes from middleware processing
- Debug complex matcher configurations with live URL testing
Middleware Matcher Builder
Build and test Next.js middleware config matcher patterns visually.
export const config = {
matcher: [],
}Frequently Asked Questions
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What is Middleware Matcher Builder?
Middleware Matcher Builder is a Next.js development utility that build and test next.js middleware config matcher patterns visually. It includes Pattern Builder, Live Testing, Regex Preview to accelerate your Next.js workflow. All processing happens locally.
Next.js projects involve configuration files, routing decisions, and performance considerations that can slow down development. Middleware Matcher Builder provides focused utilities that generate boilerplate code, visualize configurations, and calculate image optimization parameters — all without leaving your browser. This lets you stay in your development flow while quickly generating the code snippets and configurations your project needs.
Frequently Asked Questions
What does a middleware matcher do?
The matcher config in next.config.js tells Next.js which paths should trigger your middleware. It uses pattern matching to include or exclude specific routes.
How do I exclude certain paths from middleware?
Use negative lookahead patterns or list specific paths to match. The builder lets you visually add and remove paths from the matcher configuration.
Can I test if a URL matches my pattern?
Yes. The live testing feature lets you enter any URL and see instantly whether it matches or is excluded by your matcher pattern.
Is my matcher config sent to a server?
No. All pattern building and testing happens locally in your browser.
How does the Pattern Builder feature work?
The Pattern Builder feature build matcher patterns with visual toggles for paths, params, and conditions. It is designed to be intuitive and responsive, giving you immediate feedback as you interact with the tool. All processing happens locally in your browser.
What is the benefit of live testing?
Live Testing test urls against your matcher patterns and see match/no-match results. This capability sets Middleware Matcher Builder apart from basic alternatives by providing more comprehensive functionality while maintaining the privacy and speed of local processing.
Is Middleware Matcher Builder really free to use?
Yes, Middleware Matcher Builder is completely free with no hidden charges, no sign-up requirements, and no usage limits. You can use it as often as you need, for any purpose — personal projects, commercial work, or educational use. There are no premium tiers or paid features.
Does Middleware Matcher Builder work on mobile devices?
Yes, it works on any device with a modern web browser — desktop, tablet, or phone. The interface is responsive and adapts to your screen size. Since all processing is done locally, you get the same performance regardless of your device.
What happens to my data when I use Middleware Matcher Builder?
Your data never leaves your device. Every operation is performed locally in your browser using JavaScript. No information is uploaded, stored, logged, or shared with any server. This privacy-first approach means you can work with sensitive data — passwords, API keys, personal information — without any risk of exposure.
Key Features
Pattern Builder
Build matcher patterns with visual toggles for paths, params, and conditions.
Live Testing
Test URLs against your matcher patterns and see match/no-match results.
Regex Preview
See the compiled regex from your matcher patterns.
Config Export
Export the complete matcher configuration ready for middleware.ts.
Common Use Cases
Middleware Matcher Builder is useful in a variety of scenarios across different workflows:
Build and test matcher patterns for authentication middleware
Exclude static assets and API routes from middleware processing
Debug complex matcher configurations with live URL testing
Tips & Best Practices
Use negative lookahead for exclusions
Use patterns like `/((?!api|_next/static|favicon.ico).*)` to exclude common paths from middleware execution.
Order matchers for performance
List more specific paths first in your matcher array so they match faster, improving middleware performance.
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next.config Visualizer
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Image Optimization Calculator
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