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verhagen (35) [Avatar] Offline
11.2 Handling errors with Express.js

The last sentence is not correct, don’t should not be there.

You need to use four parameters in this error handler, with the error parameter always first. Without all four parameters, the next object may not be present, and you don’t need to have that object in this function to call the next middleware function.

TheWexler (62) [Avatar] Offline
You're right, the wording here is confusing. I changed that text to more accurately explain how the function signature determines the type of middleware function.