Nest.js | Middleware, Pipes & Interceptors Explained By Example

Timestamps:
00:00:00 Introduction
00:00:30 Diagram
00:04:50 Project Setup
00:05:45 Middleware
00:13:30 Guards
00:16:56 Interceptors
00:25:00 Pipes
00:28:53 Filters

[williamx]

Wow this was amazing! Thanks so much for teaching us all of this again! As always lots of knowledge gained from watching your videos. Many thanks! What I learned is that the path a request goes through in order is...
1) Middleware - For things like authenticating a user
2) Guards - To check a user is authenticated before getting to the controller (manager of the task) among other use cases
3) Interceptor (before) - Can be used to log the method, url, userAgent, ip, controller name (ie., AppController), controller handler/method name (ie., getHello). Can also be used to transform incoming data
4) Pipes - Can be used to freeze parameters in the request so it isn't mistakenly changed in the code. Also validate input data, transform input data, etc. Typical usage is validating request parameters with built in NestJS pipes like ParseIntPipe, ParseArrayPipe, ParseUUIDPipe
5) Route handler - The "manager" that tells the provider (ie., service/worker/task implementer) what to do
6) Interceptor (after) - Can get the response and status code after handled by the control handler (ie., the method/function inside the manager). Useful for logging. Can be accessed via
7) Exception filters - To log errors internally or change the error response into user friendly wording for better UI
Then it becomes a beautiful response

Wooh! Just wrote the above to summarize what I learned - all info from going through this video. Thanks again and looking forward to your future videos! And ofc I gave your video a like as it's very helpful.

[SHIVAMPANDEYSJTG]

One of the best explanations I have seen. In just 30 minutes every things is explained in such a depth.

[phn]

I've been using NestJs for 2 years and wirh this video I have witnessed the power of scoped dependency injection. Thank you!

[thestereokid]

this is so great, been trying to figure out how I'm gonna get all the userIds to track operations and permissions. Gonna watch this properly next week and refactor my code.

[TheSiddhaartha]

This is a useful example to quickly understand the concepts of NestJs. I had forgotten all of it as I didn't use it for few months. Now trying to quickly revise the concepts and also understand other things which I had not used before. Your videos have been very helpful!

[innocentmazando]

I just got some lessons on good architecture here :)

The request service and freezing requests, am definitely applying that onto my current toy project and beyond.

Thanks a lot Michael

[Nageswararao]

One of the best explanations I have seen. Thank you so much for the great video Michael.

[warpmonkey]

Great video, you deserve many more subscribers, keep up the great work.

I love it that you take the time to keep going through the different ways that features can be hooked into the code base, it's that type of repetition that helps teach the pattern rather than summarise the options.

[johnmark-psjy]

Concept simply explained. You deserve more subscriptions. Thank you very much!

[TusharParekhtpar]

Awesome Explanations and fluent demonstrations on Request-Response Pipeline for Nest JS . I really appreciate your efforts and thank you very much for such deep insights !!

[miguelacosta]

This is a great video, I wanna say thank you for explaining these concepts in an easy way

[mauriciomatias]

Thank you!! what a nice and clean way to explain how nest works

[marudhuraj]

Super explanation about the framework flow architecture, Really a great job.

[ВикторСмольяков-щв]

All of this stuf were explained simple and clear... Thank you!

[kisstamas]

This video is very useful. The nestjs framework is huge. It is similar the complexity like Laravel in php language.

[PranayUsgaonkar]

Best diagram to get an overview of what is used when

[supermanor]

thanks so much for this video it helped me alot understanding the response request path and how to implement it correctly

[atakandurkal]

Very well! explained clearly now I can move on :))

[idcmardelplata]

As we say in my country, you left 10 fields... Congratulations, your content is too good :)

[kirakira]

Thank you Michael !!! You are The best🤩🤩