What is Express middleware and how does it work? (in-depth)

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For resources and other information about this video, check out the corresponding post link below at Full Stack Foundations:

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Timestamps:

0:00 Intro
2:53 The standard Express callback function
5:51 Writing your first Express middleware
10:00 Route middleware vs. global middleware
15:34 Working with several middlewares in a single app
17:59 Error handler middleware
24:56 Modifying the req and res objects using middleware
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Note to everyone watching: if you ever see your browser spin-waiting as seen in some points in this video, that's usually an indication that the app isn't completing a path through your middleware or route handlers. Sometimes it's a missing call to next(), like shown here. Sometimes there's a code path through a route handler that doesn't call a res.end(), res.json(), or res.whatever().

mykalimba
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Great video! You may be one of the few that totally explains Express middleware. Also I agree that understanding middleware will help make you a better Express Developer. I feel like a better Express Dev already

MichaelMooregrownman
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Zach! Brotha! You have single-handedly demystified everything surrounding Express and Passport for me. Something literally every major js tutorial youtuber has failed to do. So glad I found you man, thanks again. Subbed.

slow_start
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One of the few tutorial makers who create understandable ones. You deserve more views.

josuerbague
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Such understandable explanations. I love that he fully explains how and why things work.

sadhucat
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I have been trying to understand middleware concept, watched several tutorial, this explains everything perfectly and all my doubt cleared.its the best explanation on YouTube after watching all explanation on middleware

atee
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This is the best resource for understanding Express middleware on the whole internet

hyakoissei
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Thank you very much for helping to understand the middlewares in express. I have been confusing in understanding the middlewares since last a couple of months and today you helped me to understand this concept very well. Thank you again.

rizgamingvids
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The guy just gives concepts, rather than giving "how to do this" or "how to do that" tutorials.... Love from Pakistan <3

tayyabferozi
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I am at 12:17 but already liking it. Thank a lot Zach for the good explanations.

josphatoluoch
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Really appreciate the longer videos like these that really dig into the details. Thanks again so much! Subscribed.

armaandhanji
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Bro I've watched so many videos on Express middleware and NONE of them covers the concepts like you do. They are all just spitting out code without explaining WHY things work the way they do. I found the error handling and next() explanations extremely helpful.

Thank you!

Moch
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I've watched several videos explaining express.js...and this video is the most clear and informative one for me. Thank you so much :D

jjkelsey
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I dont know how u cleared my doubts that i have been confusing my myself yaah...ur magic worked....hatsoff from India ❤️

nithishkumars
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After reading/watching from multiple sources, finally someone who teaches this concept in a way that I get it!!!! Thanks Zach!!! Your teaching abilities are amazing!!! Props!!!!

justadev____
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I like your teaching very much! it is clear, calm. thank you so much, I've learnt a lot from you

thankyouthankyou
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Wow!!! Now this is an in-depth guide to express middleware.

lukemuga
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waiting for such detailed explanation from a long time, my quest is finally over !

manishmadan
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Wow! never thought I could understand this in one video. Definitely subscribing!

ukasz
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Wowww, I have been working with middlewares without actually understanding it in such details...THANK My Computer Professor I never had

chidibede