How to trigger Express error middleware?

Today's Topic: How to trigger Express error middleware?

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Just wanted to thank those users featured in this video:
Eugene Fedotov (https://stackoverflow.com/users/5340370/eugene-fedotov
giankotarola (https://stackoverflow.com/users/3889946/giankotarola)

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Related to: node.js, unit-testing, express, mocha.js

Видео How to trigger Express error middleware? канала The Debug Zone