configurable middleware example

configurableLogger.js

function configableLogger(format) {
  var re = /:(\w+)/g;
  return function(req, res, next) {
    var str = format.replace(re, (match, property) => {
      return req[property];
    });
    console.log(str);
    next();
  }
}

// usage: 


const connect = require('connect'),
      app = connect();

app
.use(configableLogger(':method :url'))
.listen(3000, () => {
  console.log('running');
});