Baseline Widely available
Note: This feature is available in Web Workers.
The has() method of the FormData interface returns whether a FormData object contains a certain key.
name
A string representing the name of the key you want to test for.
true if a key of FormData matches the specified name. Otherwise, false.
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
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