#FormData
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Do you know how to #upload a #file to server using JavaScript #fetch function only?
The Form Data object is a set of key value pairs, representing the form fields and their values.
To get an instance of the Form Data object, we can use the new operator to create a new one.
it also supports to create one from the existing html form.
We can use the corresponding methods to access or modify the data fields.
like append, get, delete and has.
if you want to upload a file to the server, simply append a file field to the form data object.
One of the most common use cases is sending form data to a server without a full page refresh.
just assign the form data object to the body option of the fetch method.
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