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Showing content from https://developer.mozilla.org/en-US/docs/Web/API/FormData/get below:

FormData: get() method - Web APIs

FormData: get() method

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The get() method of the FormData interface returns the first value associated with a given key from within a FormData object. If you expect multiple values and want all of them, use the getAll() method instead.

Syntax Parameters
name

A string representing the name of the key you want to retrieve.

Return value

A value whose key matches the specified name. Otherwise, null.

Examples

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

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

The following get() method will only return the first username value:

formData.get("username"); // Returns "Chris"
Specifications Browser compatibility See also

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