Nobel Prize-winning physicist, Richard Feynman had once said: “You know you have mastered a skill, when you can teach it to a child”. Why? Because it forces yourself to understand the concept at a deeper level and simplify relationships and connections between ideas. Great Job Koushik! Thanks.

*Timestamps* 0:00 Intro 1:34 Term 1: Resource 2:24 Term 2: Resource Owner 3:14 Term 3: Resource Server 3:52 Term 4: Client 5:00 Who has the burden of security? (Ans: Resource Server) 6:51 Term 5: Authorization Server 7:54 OAuth Flow 1 *Authorization* *Code* *Flow* 14:09 OAuth Flow 2: *Implicit* *Flow* 15:50 Drawback of Implicit Flow 18:30 OAuth for authorization between services 19:24 OAuth Flow 3: *Client* *Credentials* *Flow* (for microservices) 22:20 Wrap-up

I just don't understand why some people would thumb down on this tutorial. In fact, all the tutorials from this channel are excellent. I learned a lot from them

The tutorial is too good to having clearer view on Oauth flows. Hats off to the author

Hands down the best style of introducing technical material, that I have ever seen. Your videos are so easy to follow. I'm glad you start with concepts and examples, before going into the jargon.

Wow ...trust me i have seen 10+ videos on this topic on KZfaq. But the way you are explaining... someone who is from commerce or arts background also will understand everything..😛

Man, you have a gift for clearly explaining things, thank you very much for theses great videos.

Amazing explanation. Hope my son in college gets a "resource" (professor) like you. God Bless You

He made this so simple. He knows the art of teaching.

Amazing lesson JB once AGAIN..great stuff!!

Thanks Koushik. Got to learn more about OAuth in meaningful and useful way. Please keep teaching more.

Thanks! I'm from Belarus and sometimes to hard to parse bad pronunciation, but yours is very clearly. Very useful explanation, one of the best learning channels!

I must thank you for making me understand it in a better, simplified way. Your deep understanding on the topic is adorable. Once, again thank you

Your style of explanation / teaching is really top-notch! Great work

This is an awesome explanation. It just had what I wanted to clarify.... Thbskd watching this video. thanks and kudos to you sir

Thanks Kaushik. Amazing video with the right set of analogies used at the right place. Kudos. 👍

You are a master of many concepts which many people want to learn.Kudos to You Kaushik.

Thank you!!!! I never know what "client" site means until now. There are so many things on the internet, and unfortunately people just assume it's common knowledge and don't bother explain them, which makes the process so much harder and frustrating. Thank you for taking the time

Thank you very much again for this clean explanation. I appreciate you very much.

Very well explained. One of the best videos that explains OAuth

Thanks Kaushik , This series on OAuth2 is amazin

Accidently found one video by Java brains, and this is my fifth video back to back, so additive ( things I understood in past with partial knowledge and getting confused time and again, explained o me here like a baby). I have seen many videos but no one explained like you did. Thanks a ton. Please put a link where views can make some donations if they are happy. I would love to do that

The idea of picturizing the concepts and telling a story to explain the concepts is extremely helpful and captivating sir! Thanks a lot! I derive immense sense of satisfaction on viewing your videos. Any such videos on docker and kubernetes please?

Respect for making such a video ! Superb skill of teaching.

I really loved it... the way you explained and it is clear and emphasizing examples !!!

Crystal clean concepts as always :) Thanks Koushik!

Awesome video, thanks !! Can you also cover concept of challenge in OAuth, and how enterprise SSO works with OAuth.

Love the way the topic is presented!

Great explanation Kaushik! The animations makes the illustrations way better. I would love to see you do a system design playlist which can go over the web architecture and design of various large scale applications like Netflix, Uber and Facebook. Most videos on youtube are done on the white board. It will be great if you can do one with animations. Thanks!

Superb Koushik. Really helpful. Thaks again.

You are the best java channel out there! great job!

Thank you for your great efforts . you are the best to simplify such complex concepts

Explained very well. Thank you for clearing this concept

Thanks Kaushik , was eagerly waiting for this video

Your videos are a blessing! Thank you!

Very good and crystal clear explanation with good analogy. Thanks for sharing this core concept

This explanation is amazing. Thanks!

Always... best tutorials from Java Brains.

Thanks for making it simple to understand the big concept .

Thank you so much for explaining it so beautifully

You are a lifeSaver Man. Thank You so Much Sir.

Hi Kaushik. Thanks a lot for providing such great content. You are doing great service to the community. Can you please release few videos on saml as well ? What is saml and how does it differ from oauth and how to implement it using spring boot .

best explanation of oauth. thank you very much

awesome tutorial !!! It got a great understanding on this topic and it clarifies my doubts too. thank you.

It makes sense now. Thanks!

Informative and useful!!!!

Great job, with you its easy to understand !

Excellent content! Kudos my friend

Thanks! lucid explanation, well presented. Slightly J as well :)

Great style to explain!

Nice work. Thank you!

it will be great if you start a series on SOLID and Design Pattern in Java/any oops language. I know there are lots of material out there on internet related to these but I believe your way of teaching style will help out lots of ppl. and if you do please try to make each SOLID principle example not related to each topic. Thanks

Great stuff man You helped clear my interview. Got the offer from company 🔥

Hello, Thank you for your great efforts, could you please cover sso with active Directory and Apache server ?

You are a supreme teacher!

Thanks for the effort, very well explained.

wow...very good explanations...i really enjoyed your teaching style!!..Thanks for making such a good efforts!

Very nice introduction sir. I love your teachings. It helps me so much in understanding complex concepts which seems very difficult to me before. Sir, as honest request, can you please teach the implementation (demo) on the three flows you mentioned in this tutorial. Please sir👏 And thanks so much for these lessons.

Excellent explanation, before this video series, i always afraid about Spring Security. many thanks

Loved your awesome explanation!!

You made this topic very easy to understand.. nice 👌

Great job. Thanks a lot for making this video.

your tutorials are awesome ....

Amazing presentation skills 👍

Wow, amazing explanation 🙏

Thank you sir, could you please cover open id connect as well.

Great explanation! Thank you dudee✨

Excellent explanation in details..!! Thank you..:)

Awesome Explanation !!

Love the explanation and teaching

Excellent tutorial!!

Loved watching it! Can you create a single flow chart showing all the flows in one frame ? for non-implicit and implicit flows ?

Brilliant explanation 💯💯

You are amazing bro. Thank you for everything

Thanks, very helpful video! A few questions on the third flow, Client Credentials: 1. You mention that micro service 2 has an authentication server. But in the terminology we only talked about an authorization server--is this indeed a different thing, or did you mean to say authorization and not authentication? 2. In the second step, after MS1 goes to the MS2 Auth server, it receives an access token for, you say, only the API calls that it should have access to. But how does the auth server know what MS1 should have access to? My guess here is that this is indeed an authentication server, and that the server is meant to know ahead of time who MS1 is and what kind of access it should have, and that this is what is meant by a super trustworthy client, but I'd like to confirm if this is correct.

You, sir, are a legend.

well explained! thank you!

Thanks Kaushik for such a wonderful video very clearly explained like you always do. I just wanted to know why implicit flow is less secured?? although in both kind of flows(authorization and implicit flow) client application has access token which can be used to access the protected resource from resource server.

Thanks for the tutorial. Please make another one on OpenID Connect protocol.

very nice video. Doupts are cleared. Subscribed and liked. 👍

Very well explained, thanks

Thanks Kauhik! Try to do a video on spring transaction management and how it works in side. Love From Sri Lanka

Amazing explanation

This is a great tutorial. Thanks

Superb explanation

very nice tutorial, thanks so much

Nicely explained. Just one point to add..the exchange of token in authorization flow happens from a server to a token end point. The call is not from browser.

I Like your OAuth explanation video. Great work..... :) Can you upload a video regarding Open ID Connect ??

Great Stuff. Thank you

I think this is one of the best explanations so far. Is there a similar video on SAML and OIDC flow on your channel?

Thank you for this. What is the best way to store the access token, refresh token, ... in your node layer for later to use? How to know if the user is still logged in so we don't ask them for credentials if they close the browser?

Finally found an Indian that makes sense :) Thank you! Subscribed.

great respect, It is an easy to start tutorial.

Thank you so much

Thumb up Kaushik :) Thank you

Hi there, thanks for your amazing tutorials, they are very helpful! One question, in the first OAuth flow (the one with the authorization token in the middle) once the client gets his access token, is it short-lived as well as OAuth flow 2? or does it last longer? or forever? thanks again! Cheers! Federico from Argentina :)

thanks brother, good tutorial

great explanation

You are the BEST!

awesome tutorial