FormData.keys

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

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

See also

• XMLHTTPRequest
• Using XMLHttpRequest
• Using FormData objects
• <form>