POST http://localhost:5000/app/auth/login 500（内部服务器错误）

Question

Hi i am newbie about this stuff please help me whenever I try to authenticate i am getting this error

https://i.stack.imgur.com/VqQRY.png

my code is here:

index

const express = require('express')
const cors = require('cors')
const mongoose = require('mongoose')
const dotenv = require('dotenv')
const authRoute = require('./routes/Auth')
const userRoute = require('./routes/User')
const examRoute = require('./routes/Exam')
const examQuestionsRoute = require('./routes/ExamQuestions')
const userExamsRoute = require('./routes/UserExams')

dotenv.config();
const app = express()
app.use(cors())
app.use(express.json())

mongoose.connect(process.env.DATABASE_ACCESS, () => console.log("db connected 
succes"))

app.use("/app/auth", authRoute);
app.use("/app/exam", examRoute);
app.use("/app/examquestions", examQuestionsRoute);
app.use("/app/userexams", userExamsRoute);

app.listen(5000, () => {
 console.log('Server started on 5000')
})

Auth router

const router = require("express").Router();
const User = require("../models/User");
const CryptoJS = require("crypto-js");

router.post("/login", async (req, res) => {
  try {
    const user = await User.findOne({ email: req.body.email });
    if (!user) {
      errors.email = "Wrong credentials!";
      res.status(404).json({ errors });
      return;
    }

    const hashedPassword = CryptoJS.AES.decrypt(
      user.password,
      process.env.PASS_SEC
    );
    const OriginalPassword = hashedPassword.toString(CryptoJS.enc.Utf8);

    OriginalPassword !== req.body.password &&
      res.status(401).json("Wrong credentials!");

    const { password, ...others } = user._doc;
    res.status(200).json({...others});
  } catch (err) {
    res.status(500).json(err);
  }
});
module.exports = router;

I do not know if it is necessary since code 500 is server side issue but the "client" code is:

import {useState } from 'react'
import { useNavigate } from "react-router-dom";
import { useDispatch, useSelector } from "react-redux";
import { login } from "../redux/apiCalls";

const Login = () => {

  const [email, setEmail] = useState("");
  const [password, setPassword] = useState("");
  const dispatch = useDispatch();

  const navigate = useNavigate()

  const handleLogin = (e) => {
    e.preventDefault();
    login(dispatch, { email, password });
  };

return ()}

redux api calls

import { publicRequest } from "../requestMethods";

export const login = async (dispatch, user) => {
  dispatch(loginStart());
  try {
    const res = await publicRequest.post("/auth/login", user);
    dispatch(loginSuccess(res.data));
  } catch (err) {
    dispatch(loginFailure());
  }
};

requestmethod.js is

export const publicRequest = axios.create({baseURL: http://localhost:5000/app/,});

i am waiting for good news guys thanks for the attention!

my terminals:

https://i.stack.imgur.com/SnJFG.png

i guess i found the error:

my error log

i have been working on this error for 3 days, i am open to any advice

Answer 1

I think your issue is due to the fact that you're sending the request two times in your code:

OriginalPassword !== req.body.password &&
  res.status(401).json("Wrong credentials!");

const { password, ...others } = user._doc;
res.status(200).json({...others});

Here you have res.status(401).json(...) and res.status(200).json(...) which might be executed one after the other. When that happens you're trying to rewrite on a response that has already been sent with the json() method, which eventually throws the error you're having