Unless you have a very small or static dataset, it will usually not be embedded in your web page. You will probably use an asynchronous request to load it from a separate file after your HTML page is already loaded and then parse it. This section covers topics related to loading and parsing external files.
Most of the examples in this book consist of a single file (not considering the external libraries loaded using the <script> tags), and you can run them by simply opening them in a browser. You don't even need a Web server. Just click on the file and view it in your browser. But this won't work in examples that load external files via Ajax. For those files, you do need a Web server.
If you are using an HTML editor, such as PHPStorm or Brackets, it automatically starts a Web server for you and serves the page to your default browser. If you have Python installed in your system (it is native in macOS and Linux, and you can...