FormData.keys()

The FormData.keys() method returns an iterator allowing to go through all keys contained in this object. The keys are USVString objects.

Note: This method is available in Web Workers.

Syntax

formData.keys();

Return value

Returns an iterator.

Example

// Create a test FormData object
var formData = new FormData();
formData.append('key1', 'value1');
formData.append('key2', 'value2');

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

The result is:

key1
key2

Specifications

Specification Status Comment
XMLHttpRequest
The definition of 'keys() (as iterator<>)' in that specification.
Living Standard Initial definition

Browser compatibility

We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support 50.0 44 (44) ? (Yes) ?
Available in web workers 50.0 44 (44) ? (Yes) ?
Feature Android Android Webview Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile Chrome for Android
Basic support No support 50.0 44.0 (44) ? ? ? 50.0
Available in web workers No support 50.0 44.0 (44) ? ? ? 50.0

 

See also

Document Tags and Contributors

 Contributors to this page: teoli, jpmedley
 Last updated by: teoli,