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Title: FormData - Web APIs | MDN Authors: Venue: mdn Year: 2015 Canonical: mdn:Web/API/FormData URL: https://developer.mozilla.org/en-US/docs/Web/API/FormData Collector: mdn OA: true ABSTRACT FormData - Web APIs | MDN Skip to main content Skip to search FormData 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. See full compatibility Learn more Note: This feature is available in Web Workers. The FormData interface provides a way to construct a set of key/value pairs representing form fields and their values, which can be sent using the fetch(), XMLHttpRequest.send() or navigator.sendBeacon() methods. It uses the same format a form would use if the encoding type were set to "multipart/form-data". You can also pass it directly to the URLSearchParams constructor if you want to generate query parameters in the way a would do if it were using simple GET submission. An object implementing FormData can directly be used in a for...of structure, instead of entries(): for (const p of myFormData) is equivalent to for (const p of myFormData.entries()). Constructor FormData() Creates a new FormData object. Instance methods FormData.append() Appends a new value onto an existing key inside a FormData object, or adds the key if it does not already exist. FormData.delete() Deletes a key/value pair from a FormData object. FormData.entries() Returns an iterator that iterates through all key/value pairs contained in the FormData. FormData.get() Returns the first value associated with a given key from within a FormData object. FormData.getAll() Returns an array of all the values associated with a given key from within a FormData. FormData.has() Returns whether a FormData object contains a certain key. FormData.keys() Returns an iterator iterates through all keys of the key/value pairs contained in the FormData. FormData.set() Sets a new value for an existing key inside a FormData object, or adds the key/value if it does not already exist. FormData.values() Returns an iterator that iterates through all values contained in the FormData. Specifications Specification XMLHttpRequest # interface-formdata Browser compatibility See also Using FormData objects Help improve MDN Was this page helpful to you? Yes No Learn how to contribute This page was last modified on Jul 24, 2024 by MDN contributors. View this page on GitHub • Report a problem with this content