web api instance method
FormData: has() method
Available in workers
The has() method of the FormData interface returns whether a FormData object contains a certain key.
Syntax
has(name)
Parameters
name- : A string representing the name of the key you want to test for.
Return value
true if a key of FormData matches the specified name. Otherwise, false.
Examples
The following snippet shows the results of testing for the existence of username in a FormData object, before and after appending a username value to it with append():
formData.has("username"); // Returns false
formData.append("username", "Chris");
formData.has("username"); // Returns true
Specifications
SpecificationsStandards references are available on the canonical MDN page.
Browser compatibility
Browser compatibilityCompatibility data is available on the canonical MDN page.