comty/packages/server/services/auth/routes/availability/get.js

import { User } from "@db_models"

export default async (req) => {
    const { username, email } = req.query

    if (!username && !email) {
        throw new OperationError(400, "Missing username or email")
    }

    const user = await User
        .findOne({
            $or: [
                { username: username },
                { email: email },
            ]
        })
        .select("+email")
        .catch((error) => {
            return false
        })

    if (user) {
        return {
            message: "User already exists",
            exists: true,
        }
    } else {
        return {
            message: "User doesn't exists",
            exists: false,
        }
    }
}