FormData: keys() method

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.

Note: This feature is available in Web Workers.

The FormData.keys() method returns an iterator which iterates through all keys contained in the FormData. The keys are strings.

Syntax

js
keys()

Parameters

None.

Return value

An iterator of FormData's keys.

Examples

js
const formData = new FormData();
formData.append("key1", "value1");
formData.append("key2", "value2");

// Display the keys
for (const key of formData.keys()) {
  console.log(key);
}

The result is:

key1
key2

Specifications

No specification found

No specification data found for api.FormData.keys.
Check for problems with this page or contribute a missing spec_url to mdn/browser-compat-data. Also make sure the specification is included in w3c/browser-specs.

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobileserver
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
Deno
Node.js
keys

Legend

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Full support
Full support

See also