AWS Cognito Example using SDK for JavaScript (v3)

import { CognitoIdentityProviderClient } from "@aws-sdk/client-cognito-identity-provider";

export const cognitoCreateUser = async () => {
    try {
        const cognitoClient = new CognitoIdentityProviderClient({ region: 'Your AWS Region'});
        const params = {
            UserPoolId: 'Your Pool Id',
            Username: 'Your Username',
            UserAttributes: 'Your User Attributes',
            DesiredDeliveryMediums: ["EMAIL"],
        };
        const command = new AdminCreateUserCommand(params);
        return cognitoClient.send(command);
    } catch (err) {
        throw err;
    }
}

For further reference , please look in to this AWS Docs