FormData: getAll() method

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

Note: This feature is available in Web Workers.

The getAll() method of the FormData interface returns all the values associated with a given key from within a FormData object.

getAll(name)

An array of values whose key matches the specified name. Otherwise, an empty list.

If we add two username values to a FormData using append():

formData.append("username", "Chris");
formData.append("username", "Bob");

The following getAll() method will return both username values in an array:

formData.getAll("username"); // Returns ["Chris", "Bob"]

Specification
XMLHttpRequest Standard # dom-formdata-getall

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