higher order middleware

parseReqAndThen.js

const parseReqAndThen = (reqParser, onSuccess) => {
  return (req, res, next) => {
    const parseResult = reqParser(req);
    if (typeof parseResult !== 'undefined') {
      const successApp = connect()
        .use(onSuccess(parseResult))
        .use((req, res) => {next();});
      successApp(req, res);
      return;
    }
    next();
  };
};