Next.js, Login auth sample

auth_check.js

const bcrypt = require('bcrypt');

var AUTH_MAIL = "hoge@example.com"
var AUTH_PASSWORD="1111"
//
export default async (req, res) => {
  try{
    if (req.method === "POST") {
      var data = req.body
console.log(data)
      var retArr= {ret:0, user_id:0}
      let hashed_password = bcrypt.hashSync(AUTH_PASSWORD, 10);
      if (data.mail === AUTH_MAIL 
        && bcrypt.compareSync(data.password,  hashed_password )){
          //console.log("OK-auth:", data.mail)
          retArr.ret = 1
          return res.json(retArr);
      }else{
        //console.log("NG-auth:", data.mail)
        return res.json(retArr);
      } 
//      return res.status(403).send("");
    }
    return res.status(404).send("");
  } catch (err) {
    console.log(err);
    res.status(500).send();    
  }  
}