core-js
A modular standard library for JavaScript with polyfills for ECMAScript up to 2025 and web standards.
What is core-js?
core-js is a modular JavaScript standard library that provides polyfills for ECMAScript features up to the latest proposals and web standards. It solves the problem of missing or inconsistent JavaScript APIs in older browsers and Node.js versions, enabling developers to write modern code that works across environments.
JavaScript developers building applications that need to support older browsers or Node.js versions, as well as library authors who require consistent runtime behavior across different environments.
Developers choose core-js for its extensive and accurate polyfill coverage, modular design that minimizes bundle size, and seamless integration with tools like Babel and swc. It is the de facto standard for polyfilling JavaScript features in the ecosystem.
Overview
Standard Library
Use Cases
Best For
- Polyfilling missing ECMAScript features in legacy browsers like Internet Explorer
- Ensuring consistent JavaScript API behavior across different Node.js versions
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