With statistics.js, I wrote a JavaScript library for server and browser use that includes a wide range of basic statistical methods as well as some more complex statistical functions. The repertoire is expanded by a range of correlation methods, non-parametric and parametric tests, error analysis methods, and several complex random number generators, some of which have not yet been implemented in this form or are not available in JavaScript. The open source library is maintained on Github and is available to anyone interested to download for free and contribute to.