No setup required

Interactive Playground

Experiment with code right here in your browser. The web playground runs locally; Node, Express, and React environments launch in StackBlitz with one click.

Web Playground

HTML, CSS & JavaScript — runs locally, saved automatically.

Preview

Tip: The preview re-runs automatically as you type (with a short delay). Use Re-run to force a refresh.

Full Development Environments

Node.js, Express, React and MongoDB need a real runtime. These launch instantly in StackBlitz — a free, browser-based dev environment. No installation, no account required.

React + Vite

Full React app with hot reload, JSX, and npm packages.

JSXHooksHMR

Launch React + Vite

Node.js

Node environment with npm support and a terminal.

npmTerminalModules

Launch Node.js

Express API

Express server with routes, and a free port to test endpoints.

RESTMiddlewareRoutes

Launch Express API

MongoDB + Mongoose

Use an in-memory MongoDB via mongodb-memory-server to practice queries.

MongooseQueriesSchemas

Launch MongoDB + Mongoose

💡 How it works

StackBlitz runs a full Node.js environment in your browser using WebContainers technology. Everything is free and your code never leaves your machine.