reacjts Get multiple checkboxes value

How to get multiple checkboxes value ? Ref not working in material ui checkbox, no idea why.

<Checkbox key={i} label={catagory.name} ref="categories" value={catagory_name} name="category"  />

for example : example

I get the data from API, so it will add more from time to time. How to get the value? What function I should write? Anyone know ?