replacing string number with actual number itself

I have an api that calls:

http://localhost:3000/games?maxplayers=10

then I use

url.parse(req.url,true).query

which returns:

{ maxplayers: '10' }

I would like to replace the string that contains 10 with the actual int value of 10 so I can query my database and return a result. As of right now it returns no result because it recognizes the 10 as a string. Any insight?