Babel is a free and open-source JavaScript trans compiler that is mainly used to convert ECMAScript 2015+ (ES6+) code into a backward-compatible version of JavaScript that can be run by older JavaScript engines. Babel is a popular tool for using the newest features of the JavaScript programming language. Babel is commonly used for creating web pages. Developers can use new JavaScript language features by using Babel to convert their source code into versions of JavaScript that Web browsers can process. Formatting to a Babel is done through Spacing and indentation which should be consistent throughout your code. Many developers choose to use 4-space or 2-space indentation. In Babel, each nested statement (e.g., a statement following a '{' brace) should be indented exactly once more than the previous line's indentation.)