src/middleware.js
function omit(req, blacklist) {
    return omitBy(req, (value, key) => blacklist.includes(key));
}
function omit(req, blacklist) {
    return omitBy(req, (value, key) => blacklist.includes(key));
}
function omit ( req , blacklist ) { return omitBy ( req , ( value , key ) => blacklist . includes ( key ) ) ; }
filter out named properties from req object
filter out named properties from req object