update sendmail

+import dotenv from "dotenv";
+dotenv.config();
 import { PrismaClient } from "@prisma/client";
 import { nouns, adjectives } from "./words";
 import jwt from "jsonwebtoken";
-import nodemailer from "nodemailer";
-import sgTransport from "nodemailer-sendgrid-transport";
+import sgMail from "@sendgrid/mail";
+sgMail.setApiKey(process.env.SENDGRID_API_KEY);
 
 export const prisma = new PrismaClient();
 
@@ -25,7 +27,7 @@ export const isAuthenticated = (request) => {
 
 export const changePhoneNumber = (phoneNum, locationNum) => {
   var leftStr = locationNum;
-  var rightStr = phoneNum.slice(1, phoneNum.length());
+  var rightStr = phoneNum.slice(1, phoneNum.length);
   var newStr = leftStr + rightStr;
   return newStr;
 };
@@ -35,25 +37,26 @@ export const generateSecret = () => {
   return `${adjectives[randomNumber]} ${nouns[randomNumber]}`;
 };
 
-const sendEmail = (email) => {
-  const options = {
-    auth: {
-      api_user: process.env.SENDGRID_USERNAME,
-      api_password: process.env.SENDGRID_PASSWORD,
-    },
-  };
-  const client = nodemailer.createTransport(sgTransport(options));
-  return client.sendMail(email);
-};
+export const generateToken = (id) => jwt.sign({ id }, process.env.JWT_SECRET);
 
-export const sendSecretMail = (address, emailSecret, value) => {
-  const email = {
-    from: "vel1024@khu.ac.kr",
-    to: address,
-    subject: `Authentication key for forgotten ${value}`,
-    html: `Hello, This is khuchat, authentication key is <b>${emailSecret}</b>, copy and paste it, Thanks.`,
+export const createEMessage = (userEmail, emailSecret) => {
+  const emailMessage = {
+    to: `${userEmail}`,
+    from: "KhuChat@KhuChat.com",
+    subject: "Email from KhuChat",
+    html: `We send email for reset your password, enter this key : <b>${emailSecret}</b>`,
   };
-  return sendEmail(email);
+  return emailMessage;
 };
 
-export const generateToken = (id) => jwt.sign({ id }, process.env.JWT_SECRET);
+export const sendEmail = (userEmail, emailSecret) => {
+  sgMail.send(createEMessage(userEmail, emailSecret)).then(
+    () => {},
+    (error) => {
+      console.error(error);
+      if (error.response) {
+        console.error(error.response.body);
+      }
+    }
+  );
+};