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FormData - Fetch - Web documentation
interface FormData

Provides a way to easily construct a set of key/value pairs representing form fields and their values, which can then be easily sent using the XMLHttpRequest.send() method. It uses the same format a form would use if the encoding type were set to "multipart/form-data".

Methods

append(
name: string,
value: string | Blob,
fileName?: string,
): void
delete(name: string): void
get(name: string): FormDataEntryValue | null
getAll(name: string): FormDataEntryValue[]
has(name: string): boolean
set(
name: string,
value: string | Blob,
fileName?: string,
): void