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Bundlephobia

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description Bundlephobia Overview

Bundlephobia is a web performance tool designed to analyze website asset sizes. It identifies large JavaScript bundles and other resource files contributing to slow page load times. Developers utilizing front-end technologies like JavaScript can use Bundlephobia to optimize their websites for improved speed and user experience. The tool helps reduce unnecessary file sizes, benefiting those focused on efficient web development.

help Bundlephobia FAQ

What does the web tool Bundlephobia actually measure?

Bundlephobia calculates the exact file size of a published JavaScript package before you add it to your web project. It helps developers avoid accidentally bloating their web applications with massive dependencies.

Does Bundlephobia show the gzipped size of a package?

Yes, the tool displays both the raw, uncompressed size and the minified, gzipped size of the script. It also calculates the estimated download time for users on slow 3G networks versus fast 4G connections.

How does Bundlephobia determine the download time of an npm package?

It analyzes the published package on the npm registry and builds a simulated Webpack bundle. It then uses standard network latency algorithms to estimate how long the script will take to download over various internet speeds.

Can you use Bundlephobia in your code editor or CI pipeline?

Yes, Bundlephobia offers a command-line interface (CLI) that developers can integrate into their continuous integration workflows. This allows a build to automatically fail if a pull request adds a dependency that is too large.

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