Secure the AWS API Gateway with Cognito User Pools & Cognito Authorizer

By default your API Gateway endpoints are not secured so anyone with the link can access it. In a real world scenario you would want to secure them so your users first need to authenticate and provide a token so they can be authorized.
One of the services you could use for managing your users and the sign-up/sign-in flows is Amazon Cognito. In this video I am going to show you how to set up this whole flow, creating a User Pool, signing up and signing in users, then getting the id_token and provide this to the API Gateway, in the Authorization header.
Also we're going to setup the Cognito Authorizer in API Gateway which will handle this authorization flow.
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[@Elbrond1991]

Great video! Helped heaps. Just a question, how might I be able to set up the exchange of the authorization code for the tokens in my application?

[@HoaPham-iv2ft]

I got this error "An error occurred (InvalidParameterException) when calling the AdminInitiateAuth operation: Auth flow not enabled for this client' When I tried to run your command to get token.

[@davidgomez6823]

Hello, how can I use this without the hosted UI at all?

[@myz540]

Very helpful. The cognito documentation is very bad at showing how to actually get a token.

[@iamchiragarora]

What if a Lambda Function is returning HTML Code. How to authenticate that? In simple words, if the Authentication Header is not present or is not valid, how to redirect to the Cognito UI?

[@MrThejoseph007]

hey, have you figured out the approach to achieve this with cookies?

[@KarimFayed-oy5oo]

Great Video! Thanks a lot, but how can I have the data used in registration ex email be used and saved in the backend which is also a lambda

[@ArgKilljoy]

Hi! I have one question, though. Requests to the API work fine from Postman once I've added the Cognito authorizer. But I'm now getting a CORS error when calling the api from my localhost. Do you have any suggestions? Thank you

[@Majesticcloud]

Postman is not a browser so it doesn't enforce CORS policy. However in other places such as a browser you might have CORS enforcement. So you need to enable CORS headers (Access-Control-Allow-Origin) in API Gateway so they are returned with every response.

[@luiscarlosjayk]

Question: What's the access token for? Can you use that instead of the id token?

[@glenwang1746]

Thank you so much. Your content helped me

[@JozsefPetenyi]

Thanks for this video. Saved me a ton of time

[@Majesticcloud]

Glad it helped

[@vaibhavsrivastava4645]

Good

[@mantrax314]

Thanks!

[@Majesticcloud]

You're welcome and thank you too!

[@bishop339]

Good.