NODE.JS · TYPESCRIPT · NPM

A Node.js server
in one file.

Write a TypeScript program with any npm package and run it with Node.js, right in your browser. Get a public URL for your server, build together through a link, and deploy it to run around the clock with Pro.

Start creating Explore drops

Everything a small backend needs

Runs in your browser
Press Run and a Node.js runtime starts in your tab. npm packages install there too.
A public URL, instantly
Call listen() and your server gets a tunnel URL anyone can open while it runs.
Any npm package
Import what you need. Run adds missing packages to package.json for you.
Collaborate through a link
Share the editor link and edit together in real time, cursors and all.
Permanent versions
Save snapshots that never change, and restore or fork any of them later.
Claude and Codex built in
Describe a change and let the assistant edit the drop directly.
Deploy with Pro
Keep up to three drops running around the clock, redeployed on every saved version.
Secrets and domains
Pro adds encrypted environment variables and your own domain with HTTPS.