/* var book = { title : 'brave new world', author : 'aldous huxley', rating : '2' }; var params = { title : 'lmkwxlkc', author : 'ùsdfdlfmdlf', lkklk : 'lkkklmkkmlk', oppoip :'qlksdoieqsdls' }; */ var query = _.pick(params, _.keys(book)); /* output : query = { title : 'lmkwxlkc', author : 'ùsdfdlfmdlf' }; */