import .js 삭제

client/src/apis/auth.api.js

 import axios from "axios";
-import baseUrl from "../utils/baseUrl.js";
+import baseUrl from "../utils/baseUrl";
 
 const getUser = async () => {
   const url = `${baseUrl}/api/auth`

client/src/apis/schedule.api.js

 import axios from "axios";
-import baseUrl from "../utils/baseUrl.js";
+import baseUrl from "../utils/baseUrl";
 
 const getOne = async (id, userId = "ku") => {
     const { data } = await axios.get(`${baseUrl}/api/schedule/${userId}?scheduleId=${id}`);

client/src/components/Calendar/Monthly.js

 import { useState, useEffect, useRef } from "react";
 import { useHistory } from "react-router-dom";
-import CalendarBtn from "../Buttons/CalendarBtn.js";
-import DatePickerModal from "../Modal/DatePickerModal.js";
+import CalendarBtn from "../Buttons/CalendarBtn";
+import DatePickerModal from "../Modal/DatePickerModal";
 import scheduleApi from "../../apis/schedule.api";
-import { useAuth } from "../../utils/context.js";
-import catchErrors from "../../utils/catchErrors.js";
+import { useAuth } from "../../utils/context";
+import catchErrors from "../../utils/catchErrors";
 import moment from 'moment';
 import FullCalendar from '@fullcalendar/react';
 import dayGridPlugin from '@fullcalendar/daygrid';