Web/API/FormData

The FormData interface 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".

You can also pass it directly to the URLSearchParams constructor if you want to generate query parameters in the way a <form> 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 (var p of myFormData) is equivalent to for (var p of myFormData.entries()).

Note: This feature is available in Web Workers.

Constructor

FormData(): Creates a new FormData object.

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 allowing to go through all key/value pairs contained in this object.
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 a boolean stating whether a FormData object contains a certain key.
FormData.keys(): Returns an iterator allowing to go through all keys of the key/value pairs contained in this object.
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 allowing to go through all values contained in this object.

Specifications

Specification	Status	Comment
XMLHttpRequestThe definition of 'FormData' in that specification.	Living Standard	FormData defined in XHR spec

Browser compatibility

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`FormData`	Chrome Full support 7	Edge Full support 12	Firefox Full support 4 Notes' Full support 4 Notes' Notes' Prior to Firefox 7, specifying a `Blob` as the data to append to the object, the filename reported in the `Content-Disposition` HTTP header was an empty string, resulting in errors on some servers. Starting with Firefox 7, the filename `blob` is sent.	IE Full support 10	Opera Full support 12	Safari Full support 5	WebView Android Full support ≤37 Notes' Full support ≤37 Notes' Notes' XHR in Android 4.0 sends empty content for `FormData` with `blob`.	Chrome Android Full support 18	Firefox Android Full support 4 Notes' Full support 4 Notes' Notes' Prior to Firefox 7, specifying a `Blob` as the data to append to the object, the filename reported in the `Content-Disposition` HTTP header was an empty string, resulting in errors on some servers. Starting with Firefox 7, the filename `blob` is sent.	Opera Android Full support 12	Safari iOS Full support 5	Samsung Internet Android Full support 1.0
`FormData()` constructor	Chrome Full support 7	Edge Full support 12	Firefox Full support 4	IE Full support 10	Opera Full support 12	Safari Full support 5	WebView Android Full support ≤37	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 12	Safari iOS Full support 5	Samsung Internet Android Full support 1.0
Support of `for...of`	Chrome Full support 50	Edge Full support 79	Firefox Full support 44	IE ?	Opera ?	Safari Full support 11	WebView Android Full support 50	Chrome Android Full support 50	Firefox Android Full support 44	Opera Android ?	Safari iOS Full support 11	Samsung Internet Android Full support 5.0
`append`	Chrome Full support 7	Edge Full support 12	Firefox Full support 4 Notes' Full support 4 Notes' Notes' Prior to Firefox 7, specifying a `Blob` as the data to append to the object, the filename reported in the `Content-Disposition` HTTP header was an empty string, resulting in errors on some servers. Starting with Firefox 7, the filename `blob` is sent.	IE Full support 10 Notes' Full support 10 Notes' Notes' With the "Include local directory pass when uploading files to a server" option enabled, IE will change the filename inside the `Blob` on the fly. To have direct control of the sent filename, the developer should send the filename as the third parameter value, i.e. `formData.append(name, value, filename)`.	Opera Full support 12	Safari Full support 5	WebView Android Full support 3 Notes' Full support 3 Notes' Notes' XHR in Android 4.0 sends empty content for `FormData` with `blob`.	Chrome Android Full support 18	Firefox Android Full support 4 Notes' Full support 4 Notes' Notes' Prior to Firefox 7, specifying a `Blob` as the data to append to the object, the filename reported in the `Content-Disposition` HTTP header was an empty string, resulting in errors on some servers. Starting with Firefox 7, the filename `blob` is sent.	Opera Android Full support 12	Safari iOS Full support 5	Samsung Internet Android Full support 1.0
`delete`	Chrome Full support 50	Edge Full support 18	Firefox Full support 39	IE No support No	Opera Full support Yes	Safari Full support 11	WebView Android Full support Yes	Chrome Android Full support 50	Firefox Android Full support Yes	Opera Android Full support Yes	Safari iOS No support No	Samsung Internet Android Full support 5.0
`entries`	Chrome Full support 50	Edge Full support 18	Firefox Full support 44	IE No support No	Opera Full support 37	Safari Full support 11	WebView Android Full support 50	Chrome Android Full support 50	Firefox Android Full support 44	Opera Android Full support 37	Safari iOS Full support 11	Samsung Internet Android Full support 5.0
`get`	Chrome Full support 50	Edge Full support 18	Firefox Full support 39	IE No support No	Opera Full support 37	Safari Full support 11	WebView Android Full support 50	Chrome Android Full support 50	Firefox Android Full support 39	Opera Android Full support 37	Safari iOS Full support 11	Samsung Internet Android Full support 5.0
`getAll`	Chrome Full support 50	Edge Full support 18	Firefox Full support 39	IE No support No	Opera Full support 37	Safari Full support 11	WebView Android Full support 50	Chrome Android Full support 50	Firefox Android Full support 39	Opera Android Full support 37	Safari iOS Full support 11	Samsung Internet Android Full support 5.0
`has`	Chrome Full support 50	Edge Full support 18	Firefox Full support 39	IE No support No	Opera Full support Yes	Safari Full support 11	WebView Android Full support Yes	Chrome Android Full support 50	Firefox Android Full support Yes	Opera Android Full support Yes	Safari iOS No support No	Samsung Internet Android Full support 5.0
`keys`	Chrome Full support 50	Edge Full support 18	Firefox Full support 44	IE No support No	Opera Full support Yes	Safari Full support 11	WebView Android Full support 50	Chrome Android Full support 50	Firefox Android Full support 44	Opera Android ?	Safari iOS Full support 11	Samsung Internet Android Full support 5.0
`set`	Chrome Full support 50	Edge Full support 18	Firefox Full support 39	IE No support No	Opera Full support 37	Safari Full support 11	WebView Android Full support 50	Chrome Android Full support 50	Firefox Android Full support 39	Opera Android Full support 37	Safari iOS Full support 11	Samsung Internet Android Full support 5.0
`values`	Chrome Full support 50	Edge Full support 18	Firefox Full support 44	IE No support No	Opera Full support 37	Safari Full support 11	WebView Android Full support 50	Chrome Android Full support 50	Firefox Android Full support 44	Opera Android Full support 37	Safari iOS Full support 11	Samsung Internet Android Full support 5.0
Available in workers	Chrome Full support Yes	Edge Full support ≤18	Firefox Full support 39	IE No support No	Opera Full support Yes	Safari No support No	WebView Android Full support Yes	Chrome Android Full support Yes	Firefox Android Full support Yes	Opera Android Full support Yes	Safari iOS No support No	Samsung Internet Android Full support Yes

Legend

Full support: Full support
No support: No support
Compatibility unknown: Compatibility unknown
See implementation notes.': See implementation notes.