https://expressjs.com/en/guide/error-handling.html Express error handling Error Handling Error Handling refers to how Express catches and processes errors that occur both synchronously and asynchronously. Express comes with a default error handler so you don’t need to write your own to get started. Catching Errors It’s important expressjs.com 코드 마지막에 에러를 처리하는 코드를 추가한다. app.use((req, res, next) =..