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It's mostly useful when you need to send form data to RESTful API endpoints, for example to upload single or multiple files using the XMLHttpRequest interface, the fetch () API or Axios. You can create a FormData object by instantiating the FormData interface using the new operator as follows: const formData = new FormData() How to Set Up an Event Handler. With HTML, to access a file on the user's device, we have to use an with the "file" type. And in order to create the HTTP request to upload the file, we have to use a