Cognitoへのログインコード

login.js

// npm install @aws-sdk/client-cognito-identity
import {
  AuthenticationDetails,
	CognitoUserPool,
	CognitoUserAttribute,
	CognitoUser,
} from 'amazon-cognito-identity-js';

var poolData = {
	UserPoolId: '', 
	ClientId: '',
};    

function login(email, password) {
const authDetails = new AuthenticationDetails({
      Username: email,
      Password: password
    });
    const userPool = new CognitoUserPool(poolData);
    const cognitoUser = new CognitoUser({
      Username: email,
      Pool: userPool
    });
    cognitoUser.authenticateUser(authDetails, {
      onSuccess: (result) => {
		    const accessToken = result.getAccessToken().getJwtToken();
        console.log(accessToken);
      },
      onFailure: function(err) {
		    alert(err.message || JSON.stringify(err));
      }
    });
}