Bundle Size Checker

A quick npm package size checker and online bundler created by Okiki Ojo that enables developers to analyze the bundle size of any npm package in real time directly in the browser without installing anything. The tool uses esbuild compiled to WebAssembly for client-side bundling, resolving dependency trees, tree-shaking unused exports, and computing accurate minified, gzip, and brotli sizes that reflect what a production build would produce. The search interface accepts package names with optional version specifiers and supports importing multiple packages simultaneously to measure their combined impact. Advanced configuration includes externals for excluding specific dependencies from the bundle calculation, package aliases for substituting one package with another such as using preact instead of react, custom code input through an integrated code editor with Prettier formatting, and build target selection from es2015 through esnext. The platform provides a REST API accessible through edge-deployed endpoints returning JSON with size metrics, module counts, and dependency graphs. Badge generation produces SVG badges showing bundle size that can be embedded in README files and documentation. Results can be shared via URL, and the tool integrates with bundlephobia as an alternative. The project is open source on GitHub under the MIT license with sponsorship from Upstash, Vercel, and SheetJS, and was featured on Product Hunt.