We can create a Cognito user pool as follows:

aws cognito-idp create-user-pool 
    --cli-input-json file://create-user-pool-cli-input.json 
    --region us-east-1 
    --profile admin

The create-user-pool-cli-input.json file has the following contents:

{
    "PoolName": "javscript_pool",
    "Policies": {
        "PasswordPolicy": {
            "MinimumLength": 8,
            "RequireUppercase": true,
            "RequireLowercase": true,
            "RequireNumbers": true,
            "RequireSymbols": true
        }
    },
    "AutoVerifiedAttributes": [
        "email"
    ],
    "AliasAttributes": [
        "email"
    ],
    "EmailVerificationMessage": "Your verification code from MyApp is {####}",
    "EmailVerificationSubject": "Your verification code from MyAp",
    "UserPoolTags": {
        "Team": "Dev"
    }
}

This is the same as what we have seen in Chapter 4, Application Security with Amazon Cognito, which we can refer to for more details and explanations.

Create a user pool client:

aws cognito-idp create-user-pool-client 
    --user-pool-id us-east-1_P8srRzYqn 
    --client-name javscript-pool-client 
    --explicit-auth-flows USER_PASSWORD_AUTH 
    --region us-east-1 
    --profile admin

Replace the user pool ID value with the ID of the user pool you created in the previous step.