What is Middleware in Express JS? Node.js Tutorials for Beginners

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What is middleware in Express JS? You will learn the answer in this Node.js & Express tutorial for Beginners. Error handler and logger custom middleware, built-in middleware and third party middleware will all be applied in this lesson for beginners.
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This lesson is part of an Node.js & Express for Beginners tutorial series playlist:
https://www.youtube.com/playlist?listPL0Zuz27SZ-6PFkIxaJ6Xx_X46avTM1aYw
Starter Source Code: https://github.com/gitdagray/express_intro
What is Middleware in Express JS? Node.js Tutorials for Beginners
(00:00) Intro
(00:05) Welcome
(00:15) Intro and Setup
(00:33) What is middleware?
(01:37) Applying built-in middleware
(07:03) Creating custom middleware
(14:49) Adding third party middleware
(23:00) Creating a custom error handler
(30:43) app.use() vs app.all()
(32:03) Improving the custom 404 route handler
References:
Node.js Official site: https://nodejs.org
NPM Official site: https://www.npmjs.com/
Express JS Official site: https://expressjs.com/
MDN CORS: https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS
NPM CORS: https://www.npmjs.com/package/cors
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