Wrap async function to express compatible middleware

index.js

// wrapper function
function wrap (fn) {
  return function (req, res, next) {
    return fn(req, res, next).catch(err => {
      // handle general error here
      next(err)
    })
  }
}

// usage as express middleware
app.use(wrap(async function (req, res, next) {
  const users = await req.db('users')
  res.status(200).json({ users })
}))