Tailwind CSS v4 Config Migrator — Automate Your Upgrade
Tailwind CSS v4 is the most significant rewrite in the framework's history. The JavaScript configuration file is gone — replaced by a **CSS-first @theme {} block** where your design tokens live as native CSS custom properties. If you have a large tailwind.config.js with dozens of custom colors, fonts, and breakpoints, migrating manually is error-prone and time-consuming.
The **DevUtility Hub Tailwind v4 Config Migrator** automates the structural conversion so you can upgrade in seconds, not hours.
🔄 What Changes in Tailwind v4
The core paradigm shift:
| v3 (JavaScript) | v4 (CSS-first) |
|---|---|
| theme.extend.colors.primary | --color-primary in @theme {} |
| theme.fontFamily.sans | --font-sans in @theme {} |
| theme.screens.lg | --breakpoint-lg in @theme {} |
| theme.spacing['128'] | --spacing-128 in @theme {} |
| theme.borderRadius['4xl'] | --radius-4xl in @theme {} |
| import 'tailwindcss/base' | @import "tailwindcss" |
⚡ What This Tool Migrates Automatically
--spacing-*--radius-*--breakpoint-*⚠️ What Requires Manual Migration
Some v3 features have no direct 1:1 CSS equivalent:
plugins: [] — Each plugin must be updated individually; most have v4-compatible releasesdarkMode: 'class' — Replaced by @custom-variant dark (&:where(.dark, .dark *))important — Use the ! prefix directly in Tailwind classesprefix — Use @import with namespace in v4The tool will flag these automatically with instructions.
🛡️ 100% Client-Side — Your Config Never Leaves Your Browser
Your tailwind.config.js may contain internal color systems, brand tokens, and proprietary design decisions. **DevUtility Hub is 100% Client-Side**. The entire parsing and conversion logic runs in your browser's local memory. Nothing is transmitted or logged.
Zero-Knowledge Execution & Edge Architecture
Unlike traditional monolithic developer utilities, DevUtility Hub operates entirely on a Zero-Knowledge architectural framework. When utilizing the Tailwind CSS v3 → v4 Config Migrator, all computational workload is completely shifted to your local execution environment via WebAssembly (Wasm) and your browser's native JavaScript engine (such as V8 or SpiderMonkey).
Why Local Workloads Matter
Transmitting proprietary JSON objects, sensitive source code, or unencrypted text strings to an unknown third-party server introduces critical security vulnerabilities. By executing the Tailwind CSS v3 → v4 Config Migrator securely within the isolated sandbox of your Document Object Model (DOM), we structurally guarantee strict compliance with major data protection regulations like GDPR, CCPA, and HIPAA. We do not ingest, log, or telemetry your text payloads. Your local RAM serves as the absolute boundary.
Network-Free Performance
Furthermore, by completely eliminating asynchronous HTTP POST payloads to a centralized cloud infrastructure, we guarantee effectively zero latency. The Tailwind CSS v3 → v4 Config Migrator provides instant execution without arbitrary rate limits, artificial file size constraints, or server timeouts. Our global edge network serves the application wrapper, while your local machine handles the heavy lifting.
Senior DevTools Architect • 15+ Yeaers Exp.