pino-http.js

// ...
function loggingMiddleware (req, res, next) {
  const id = genReqId(req)
  req.log = res.log = logger.child({reqId: id})
  req.log[useLevel]({req}, 'Recieved request')
  res[startTime] = res[startTime] || Date.now()

  if (!req.res) { req.res = res }

  res.on('finish', onResFinished)
  res.on('error', onResFinished)

  if (next) {
    next()
  }
}
// ...