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
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
BCD tables only load in the browser