Why is my FormData object empty?

Question

When I run

var data = new FormData();
data.append("somekey", "somevalue");
console.log("data = " + JSON.stringify(data)); // TEST

I get empty braces printed to the console. Why is this?

Answer 1

The FormData API doesn't include anything to expose the content of it back to the client.

It isn't empty. You just don't have a way to look at what is inside it.

The data you have appended will still appear when you send() it with XMLHttpRequest .