// After body-parsing middleware...
app.use(function(req, res, next) {
  console.log(
    "curl '%s://%s%s' -X %s -H 'Content-Type: %s' -d '%s'",
    req.protocol,
    req.get("host"),
    req.originalUrl,
    req.method,
    req.get("Content-Type"),
    JSON.stringify(req.body)
  );

  next();
});