The problem
Quick experiments with HTML, CSS, and JS often mean juggling local files, build steps, or heavy IDEs — with no instant preview or easy way to share a snapshot.
Approach
Built Upi Line as a lightweight in-browser workspace: Monaco for editing, live preview, optional Tailwind, responsive viewport modes, open local files and folders, and export or download the project as a bundle.
Outcome
A self-contained editor at upi-line-code-editor.vercel.app for prototyping pages and small sites without leaving the browser.