What is a WebContainer and how does it work?

WebContainer is a WebAssembly-based runtime that runs Node.js directly in your browser, eliminating the need for local installation.

How do I upload my project ZIP file?

Simply drag and drop your ZIP file into the circular upload zone, or click to browse and select it from your computer.

What file types are supported for upload?

We support .zip files containing any web project (HTML, CSS, JS, TypeScript, React, Next.js, Vue, Angular, etc.).

Does my project need a package.json file?

Yes, for Node.js-based projects. However, we also support static HTML projects without package.json.

How long does the installation process take?

Installation time depends on your project size and dependencies. Most projects complete in 30-60 seconds.

Is my code stored permanently?

Projects are stored in your browser's memory. For permanent storage, we recommend downloading your project.

How to Test Next.js Projects Without Installing Anything

Testing a Next.js project traditionally requires Node.js, npm, and downloading the full repository. With BuildInBrowser, this workflow takes seconds.

Step-by-Step Guide

Zip Your Project: Archive your Next.js directory (exclude node_modules and .next to save time).
Drag & Drop: Upload the zip file into our browser interface.
Automated Setup: We automatically extract the files, mount them to the WebContainer, and run npm install.
Live Preview: The dev server starts instantly, presenting you with a live, hot-reloading iframe of your application.

This workflow is perfect for reviewing pull requests, evaluating open-source projects, or conducting technical interviews without polluting your local machine.