base64-js encodes and decodes base64 strings in JavaScript. It's optimized for browser and Node environments, providing performant conversion between base64 and byte arrays. This package implements the RFC 4648 standard, ensuring broad compatibility. It's lightweight, dependency-free, and ideal where direct manipulation of binary data and base64 encoding are required, such as handling files or network protocols. Offers a simple API with toByteArray and fromByteArray functions.