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An open-source server environment is Node.js. Cross-platform Node.js may be used with Windows, Linux, Unix, and macOS. A back-end JavaScript runtime environment is Node.js. JavaScript code is executed outside of a web browser using the V8 JavaScript Engine, which powers Node.js. JavaScript may be used by developers to create server-side scripts and command-line tools using Node.js. Before the page is transmitted to the user's web browser, dynamic web page content is created using the server-side capabilities of scripts. Node.js, which unifies web application development around a single programming language rather than separate languages for server-side and client-side scripts, reflects a "JavaScript everywhere" paradigm as a result.
Node.js was written initially by Ryan Dahl in 2009, about thirteen years after the introduction of the first server-side JavaScript environment, Netscape's LiveWire Pro Web. The initial release supported only Linux and Mac OS X. Its development and maintenance was led by Dahl and later sponsored by Joyent.