Cognito for user authentication in AWS - Step-by-Step Execution

Process Flow - Cognito for user authentication

User opens app

↓

User enters credentials

↓

App sends credentials to Cognito

↓

Cognito verifies credentials

↓

User [Error shown

↓

App receives token

↓

User accesses app features

User enters credentials, Cognito checks them, then returns a token if correct, allowing app access.

Execution Sample

AWS

1. User inputs username and password
2. App calls Cognito to authenticate
3. Cognito checks credentials
4. If valid, Cognito returns token
5. App uses token for access

This flow shows how Cognito authenticates a user and returns a token for app access.

Process Table

Step	Action	Input	Cognito Response	Result
1	User inputs credentials	username, password	N/A	Credentials ready
2	App sends credentials to Cognito	username, password	Checking credentials	Waiting for response
3	Cognito verifies credentials	username, password	Valid	Authentication success
4	Cognito returns token	N/A	JWT token	Token received by app
5	App grants access	Token	N/A	User logged in

💡 Authentication ends after token is received or error if credentials invalid

Status Tracker

Variable	Start	After Step 1	After Step 3	After Step 4	Final
username	empty	user123	user123	user123	user123
password	empty	pass123	pass123	pass123	pass123
authStatus	none	none	valid	token issued	authenticated
token	none	none	none	jwt_token_string	jwt_token_string

Key Moments - 2 Insights

Why does the app need a token after authentication?

The token proves the user is authenticated and lets the app allow access without asking for credentials again, as shown in step 4 and 5 of the execution_table.

What happens if credentials are wrong?

Cognito responds with an error instead of a token, so the app shows an error and does not log in the user. This is implied in the 'No' branch in the concept_flow.

Visual Quiz - 3 Questions

Look at the execution_table, what is the Cognito response at Step 3?

A Valid

B JWT token

C Error

D Checking credentials

💡 Hint

Check the 'Cognito Response' column at Step 3 in the execution_table

At which step does the app receive the token?

A Step 2

B Step 3

C Step 4

D Step 5

💡 Hint

Look at the 'Result' column in the execution_table for when the token is received

If the password is incorrect, what changes in the execution flow?

A App grants access without token

B Cognito responds with error, no token issued

C Cognito returns a token anyway

D User inputs credentials again automatically

💡 Hint

Refer to the 'No' branch in the concept_flow and the explanation in key_moments

Concept Snapshot

Cognito authenticates users by verifying credentials.
If valid, it returns a token (JWT).
The app uses this token to allow access.
Invalid credentials cause an error and no token.
Tokens avoid repeated logins during a session.

Full Transcript

This visual execution shows how AWS Cognito handles user authentication. The user enters their username and password. The app sends these credentials to Cognito. Cognito checks if they are correct. If yes, Cognito returns a token called JWT. The app receives this token and logs the user in. If credentials are wrong, Cognito sends an error and the app shows a login failure. The token is important because it proves the user is authenticated and lets the app grant access without asking for credentials again. This flow helps keep user sessions secure and simple.