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Pretty Diff is a language-aware data comparison utility implemented in JavaScript. The online utility is capable of source code beautification, minification, and comparison of two pieces of input text. It operates by removing code comments from supported languages and then performs a pretty-print operation prior to executing the diff algorithm. An abbreviated list of unit tests is provided. The documentation claims the JavaScript pretty-print operation conforms to the requirements of JSLint. The source code is published at the Pretty Diff GitHub repository.