Use of hidden input

I have this form, which has a input type=“hidden”, but submit button and action is attached a JSON function. I was wondering how is that hidden field suppose to work and pass on into a JSON object. Generally, it is related to generation on a random number (which again makes me think how, can hidden input field does it)

.serialize() will capture hidden inputs that have a name attr.

But how do a hidden input field generates a random name, just on load with js

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