Lesson 06 · 11 min
Async handlers and the database
The handler awaits the database. Express 5 delivers the error to the error handler by itself.
A real handler goes to the database, and that's asynchronous. In Express 5 a handler can be async: if the Promise rejects, Express passes the error to next(err) and on to the error handler. In Express 4 you had to do this by hand with try/catch and next(err) or a wrapper. Move database work into a repository or service, and keep request parsing and the response in the handler.
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