JSON files are files that store data in JavaScript Object Notation. This is a lightweight format for storing data which is easy for humans to read and write. One of the best features of JSON files is that they are readable by both machines and humans (unlike XML) and more importantly, they work well with JavaScript. JSON files are commonly used for data-driven web applications. In fact, you can even use them to make a web page dynamic. JavaScript has the ability to parse these files and that’s why JSON is one of the best ways to return data to a web page. You can store data in a well-organized and easily-readable format.