node-minifier
JSON →A multi-format minification tool for JavaScript, CSS, HTML, JSON, and images with data URI support. Version 0.3.0 is the latest stable release (infrequent updates). It wraps UglifyJS2 for JS, offers image compression via local tools (jpegtran, optipng, pngcrush, pngquant, advpng, gifsicle) or smush.it API, and supports CSS data URI with webp. A notable alternative is minify or UglifyJS individually.