score:0

best way to assign or set the keys when you map over a list is to use index, which you can get from map

return (
        <>
          <ul>
            {country.country.map((item, index) => {
              return <li key={index}>{item.name}</li>;
            })}
          </ul>
        </>
      );

score:1

i think you have to call it to generate the uuid:

 return <li key={uuidv4()}>{item.name}</li>;

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