Use AWS Cognito SDK to delete all the users in a cognito user pool

delete-cognito-users.js

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

const USER_POOL_ID = "your-pool-id";

const client = new CognitoIdentityProviderClient({ region: "us-east-1" });

const listUsersCmd = new ListUsersCommand({ UserPoolId: USER_POOL_ID });

const removeAllUsers = async () => {
  const userRes = await client.send(listUsersCmd);

  if (!userRes.Users) {
    throw Error("No user found");
  }

  const deleteUserPromises = userRes.Users?.map((user) => {
    const deleteCmd = new AdminDeleteUserCommand({
      UserPoolId: USER_POOL_ID,
      Username: user.Username,
    });

    return client.send(deleteCmd);
  });

  const deleteUsersRes = await Promise.all(deleteUserPromises);
  console.log(deleteUsersRes);
};

removeAllUsers();