DEV3 Free Code Minifier and Beautifier — Source Code (React + Tailwind)

Source code of the DEV3 Code Minifier and Beautifier, an HTML, CSS and JavaScript minifier and beautifier that lazy-loads Terser and Prettier only when needed.

Free download: sign in to any DEV3 account and click Download ZIP. Try it live: https://dev3.tech/tools/code-minifier-beautifier shows the finished tool running.

What is in the download

• A standalone Vite + React + TypeScript + Tailwind CSS project: src/tool holds the tool, shared pieces sit beside it
• package.json with exact versions plus a lockfile, so npm ci works
• README.md (run, build, embed in Next.js or plain React) and an MIT LICENSE

What the code does

• Terser JS minify with optional name mangling
• Prettier standalone beautify for all three languages
• Small built-in CSS and HTML minifiers that protect strings, pre and script blocks
• Before/after size panel

Tech stack

React 19, TypeScript, Vite, Tailwind CSS 4, prettier, terser.

Install and customise

The How to install and How to use tabs list the steps. In short: unzip, npm ci, npm run dev, then copy the tool folder into your own app if you want to embed it.

Good to know

• A browser-only tool: there is no backend or database in the code.
• The built-in CSS/HTML minifiers are conservative text transforms, not full parsers.