FormData: keys() method

{{APIRef("XMLHttpRequest API")}} {{AvailableInWorkers}}

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

Syntax

keys()

Parameters

None.

Return value

An iterator of {{domxref("FormData")}}'s keys.

Examples

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

{{Specifications}}

Browser compatibility

{{Compat}}

See also

• Using FormData objects
• {{HTMLElement("Form")}}