next.config Visualizer helps you configure and build Next.js apps quickly and accurately, right in your browser. Whether you need to parse and explore next.config.js/ts options with descriptions and defaults, 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

Config Reference

Searchable reference of all next.config options with types and defaults.

JSON Input

Paste your next.config and see it parsed with explanations.

Validation

Check for common misconfigurations and deprecated options.

Comparison

Compare different config options side by side.

Common Use Cases

  • Audit existing next.config for deprecated or misconfigured options
  • Explore available configuration options before upgrading Next.js versions
  • Compare different configuration approaches for images, rewrites, and redirects
Tool

next.config Visualizer

Parse and explore next.config.js/ts options with descriptions and defaults.

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next.config Visualizer

Browse and search Next.js configuration options with types, defaults, and descriptions.

Config Reference

Searchable reference of all next.config options with types and defaults.

JSON Input

Paste your next.config and see it parsed with explanations.

Validation

Check for common misconfigurations and deprecated options.

Comparison

Compare different config options side by side.

output

The build output mode. 'standalone' for serverless deployment.

Type: 'standalone' | 'export'Default: undefined
assetPrefix

Prefix for static assets when hosted on a CDN.

Type: stringDefault: ''
basePath

Base path for the application under a sub-path.

Type: stringDefault: ''
compress

Enable gzip compression for rendered content.

Type: booleanDefault: true
devIndicators

Configuration for the development indicators overlay.

Type: objectDefault: { position: 'bottom-left' }
distDir

Custom build output directory.

Type: stringDefault: '.next'
env

Environment variables available at build time.

Type: objectDefault: {}
eslint

ESLint configuration for builds.

Type: objectDefault: { ignoreDuringBuilds: false }
experimental

Experimental features (may change without notice).

Type: objectDefault: {}
generateBuildId

Custom build ID generation function.

Type: functionDefault: undefined
generateEtags

Enable or disable ETag generation.

Type: booleanDefault: true
headers

Custom HTTP headers for specific paths.

Type: functionDefault: undefined
httpAgentOptions

HTTP agent configuration for server-side requests.

Type: objectDefault: { keepAlive: true }
i18n

Internationalization configuration.

Type: objectDefault: undefined
images

Image optimization configuration.

Type: objectDefault: { formats: ['image/webp'] }
logging

Logging configuration for the server.

Type: objectDefault: undefined
middleware

Custom middleware file path.

Type: stringDefault: undefined
onDemandEntries

Configuration for on-demand entry compilation.

Type: objectDefault: { maxInactiveAge: 60000, pagesBufferLength: 5 }
outputFileTracing

Enable output file tracing for standalone deployment.

Type: booleanDefault: true
pageExtensions

File extensions to resolve as pages.

Type: string[]Default: ['tsx', 'ts', 'jsx', 'js']
poweredByHeader

Include X-Powered-By header in responses.

Type: booleanDefault: true
productionBrowserSourceMaps

Enable source maps in production.

Type: booleanDefault: false
reactStrictMode

Enable React strict mode for development.

Type: booleanDefault: false
redirects

URL redirect configuration.

Type: functionDefault: undefined
rewrites

URL rewrite configuration.

Type: functionDefault: undefined
sassOptions

SASS compiler options.

Type: objectDefault: {}
serverExternalPackages

Packages to mark as external on the server.

Type: string[]Default: []
trailingSlash

Add trailing slash to URLs.

Type: booleanDefault: false
transpilePackages

Packages to transpile with Next.js compiler.

Type: string[]Default: []
typescript

TypeScript configuration for builds.

Type: objectDefault: { ignoreBuildErrors: false }
webpack

Custom webpack configuration.

Type: functionDefault: undefined

Frequently Asked Questions

Paste your next.config.js/ts file and the tool parses every option with descriptions, expected types, default values, and any deprecation warnings.
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What is next.config Visualizer?

next.config Visualizer is a Next.js development utility that parse and explore next.config.js/ts options with descriptions and defaults. It includes Config Reference, JSON Input, Validation 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. next.config Visualizer 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 can I see in the next.config visualizer?

Paste your next.config.js/ts file and the tool parses every option with descriptions, expected types, default values, and any deprecation warnings.

Does it validate my configuration?

Yes. It checks for common misconfigurations, deprecated options, and type mismatches in your next.config file.

Can I compare different config options?

Yes. The comparison feature lets you view different configuration options side by side to understand the trade-offs between settings.

Is my config data sent anywhere?

No. All parsing and validation happens locally in your browser. Your configuration never leaves your device.

How does the Config Reference feature work?

The Config Reference feature searchable reference of all next.config options with types and defaults. 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 json input?

JSON Input paste your next.config and see it parsed with explanations. This capability sets next.config Visualizer apart from basic alternatives by providing more comprehensive functionality while maintaining the privacy and speed of local processing.

Is next.config Visualizer really free to use?

Yes, next.config Visualizer 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 next.config Visualizer 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 next.config Visualizer?

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

Config Reference

Searchable reference of all next.config options with types and defaults.

JSON Input

Paste your next.config and see it parsed with explanations.

Validation

Check for common misconfigurations and deprecated options.

Comparison

Compare different config options side by side.

Common Use Cases

next.config Visualizer is useful in a variety of scenarios across different workflows:

Audit existing next.config for deprecated or misconfigured options

Explore available configuration options before upgrading Next.js versions

Compare different configuration approaches for images, rewrites, and redirects

Tips & Best Practices

Enable SWC minification

SWC minification is enabled by default in Next.js 13+. It provides faster builds than Terser while maintaining compatibility.

Use output: 'standalone' for Docker

Enable the standalone output mode in next.config for smaller, self-contained Docker deployments.

Related Tools

Explore more next.js tools to enhance your workflow:

Image Optimization Calculator

Calculate optimal image dimensions, sizes, and srcset for Next.js Image.

Middleware Matcher Builder

Build and test Next.js middleware config matcher patterns visually.

App Router Path Builder

Visual builder for Next.js App Router routes including groups and parallel routes.

Route Handler Generator

Generate Next.js App Router API route boilerplate with type safety.

Related Guides & Articles

Deepen your knowledge with these next.js guides and tutorials:

Next.js Configuration Guide

How to Use next.config Visualizer

Best Practices for next.config Visualizer

Common Mistakes in next.config Visualizer