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What is a Cognito UserPoolClient?

A Cognito UserPoolClient is an AWS construct that you can use to create an application that can call signup, login, etc for your user pool. You would use this to be able to sign up from an Android app, a serverside application, or a webapp.

Here is an example Serverless Framework UserPoolClient resource:

yaml

UserPoolClient:
  Type: "AWS::Cognito::UserPoolClient"
  Properties:
    ClientName: my-user-pool-client
    UserPoolId:
      Ref: UserPool
    ExplicitAuthFlows:
      - ADMIN_NO_SRP_AUTH
    GenerateSecret: false
    AllowedOAuthFlows:
      - implicit
    AllowedOAuthScopes:
      - phone
      - email
      - openid
    SupportedIdentityProviders:
      - COGNITO
    CallbackURLs:
      - http://localhost:3000/callback
    DefaultRedirectURI: http://localhost:3000/callback