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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
| 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 |