Bundlephobia
UnclaimedAnalyze the size and performance cost of npm dependencies for your JavaScript bundle.
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Tracked since2026
0 reviews trackedThe Bottom Line
Entry price
Free, no paid tier
Biggest pro
Helps reduce bundle size and improve load times
Biggest con
Limited to npm packages
TL;DR - Bundlephobia
- Analyzes the size of npm packages.
- Helps optimize JavaScript bundle performance.
- Scans individual packages or package.json files.
Pricing: Free forever
Best for: Individuals & startups
What is Bundlephobia?
Bundlephobia is a tool designed to help developers understand the impact of adding new npm packages to their JavaScript bundles. It provides insights into the size of a package, both minified and gzipped, and its overall performance cost. This helps developers make informed decisions about which dependencies to include, optimizing their application's load time and performance.
The tool is ideal for front-end developers, full-stack developers, and anyone working with JavaScript projects that utilize npm packages. By quickly scanning individual packages or an entire package.json file, Bundlephobia helps identify potential performance bottlenecks before they are integrated into a project, leading to more efficient and faster web applications.
Available on: Web
Pros & Cons
Pros
- Helps reduce bundle size and improve load times
- Easy to use interface for quick analysis
- Supports both individual package and project-level analysis
- Free to use
Cons
- Limited to npm packages
- Does not analyze custom code or local dependencies
Key Features
Analyze individual npm package sizeScan package.json files for multiple dependenciesDisplays minified size of packagesDisplays gzipped size of packagesProvides performance cost metrics
Pricing Plans
Free
Free
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Bundlephobia FAQ
What is Bundlephobia?
Bundlephobia is a web-based tool that helps developers understand the size and performance cost of npm dependencies. It allows you to search for individual packages or upload a package.json file to see how much they will add to your JavaScript bundle.
How much does Bundlephobia cost?
Bundlephobia is completely free to use.
Is Bundlephobia free?
Yes, Bundlephobia is a free tool.
Who is Bundlephobia for?
Bundlephobia is for front-end and full-stack developers, or anyone working with JavaScript projects that use npm packages, who want to optimize their application's bundle size and performance.
Source: bundlephobia.com