https://www.npmjs.com/search?q=React%20rating

On the db we should store “votes” array, which consists of objects like this:
{ userId: someid, vote: 5 }

Only authorized users can vote; if user already voted - we highlight he/she vote choice, and update it in db when user update ui; from the db we got “rating” value which is average from all users votes and current user vote (if any);