diligent-next/pages/api/auth/signup.js

import { connectToDatabase } from '../../../utils/helpers/dbHelpers';
import { hashPassword } from '../../../utils/helpers/hashPasswordHelpers';

async function handler(req, res) {
  if (req.method !== 'POST') {
    return;
  }

  const { fullName, username, email, password } = req.body;

  if (
    !fullName ||
    !username ||
    !email ||
    !email.includes('@') ||
    !password ||
    password.trim().length < 7
  ) {
    res.status(422).json({
      message: 'Invalid input ',
    });
    return;
  }

  const client = await connectToDatabase();
  const db = client.db();

  const existingUser = await db
    .collection('users')
    .findOne({ $or: [{ email: email }, { username: username }] });

  if (existingUser) {
    res.status(422).json({ message: 'User exists already!' });
    client.close();
    return;
  }

  const hashedPassword = await hashPassword(password);

  const result = await db.collection('users').insertOne({
    fullName: fullName,
    username: username,
    email: email,
    password: hashedPassword,
  });

  res.status(201).json({ message: 'Created user!', result: result });
  client.close();
}

export default handler;