res.type(mime.lookup(path)) -> res is a type of express.Response
res.setHeader('Content-Type', mime.lookup(path))

Can I know are above two lines the same?

CodePudding user response：

You can test by calling api from client or using log on server, check more View Express JS response headers?

CodePudding user response：

Yes it has same functionality to set Content-Type to response header.

Here documentation for res.type

https://expressjs.com/en/api.html#res.type

And here documentation for res.set

https://expressjs.com/en/api.html#res.set