Node JS

Node.js is an open-sourcecross-platformJavaScript runtime environment that executes JavaScript code outside of a browser. Node.js lets developers use JavaScript to write command-line tools and for server-side scripting—running scripts server-side to produce dynamic web page content before the page is sent to the user’s web browser. Consequently, Node.js represents a “JavaScript everywhere” paradigm, unifying web-application development around a single programming language, rather than different languages for server- and client-side scripts.

It is widely used for Custom Web Page Development using Node js and express with React