This interface reflects minimal shape of the FormData

interface FormDataLike {
    append(name: string, value: unknown, fileName?: string): void;
    getAll(name: string): FormDataEntryValue[];
    entries(): Generator<[string, FormDataEntryValue], any, any>;
    [iterator](): Generator<[string, FormDataEntryValue], any, any>;
    [toStringTag]: string;
}

Properties

[toStringTag]: string

Methods

  • Appends a new value onto an existing key inside a FormData object, or adds the key if it does not already exist.

    The difference between set() and append() is that if the specified key already exists, set() will overwrite all existing values with the new one, whereas append() will append the new value onto the end of the existing set of values.

    Parameters

    • name: string

      The name of the field whose data is contained in value.

    • value: unknown

      The field's value. This can be Blob or File. If none of these are specified the value is converted to a string.

    • OptionalfileName: string

      The filename reported to the server, when a Blob or File is passed as the second parameter. The default filename for Blob objects is "blob". The default filename for File objects is the file's filename.

    Returns void

  • Returns all the values associated with a given key from within a FormData object.

    Parameters

    • name: string

      A name of the value you want to retrieve.

    Returns FormDataEntryValue[]

    An array of FormDataEntryValue whose key matches the value passed in the name parameter. If the key doesn't exist, the method returns an empty list.