Node-zopfli is a Node.js library that provides bindings for the Zopfli Compression Algorithm, allowing developers to compress data using gzip, zlib, or deflate formats with approximately 5% better compression than standard gzip. It's designed for developers working on Node.js applications who need highly optimized compression for static content or cached resources, though it's significantly slower than gzip (about 100x slower) and best suited for scenarios where compression quality matters more than speed.