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在express中发送到客户端后无法设置标头

mongoose express node.js javascript

Harsh Patel · 技术社区 · 2 年前

我在mongodb中成功注册了哪个插入记录,但当我尝试登录时,第“!user&res.status(401).json(“错误的用户名”);”行出现错误那个

Cannot set headers after they are sent to the client
    at new NodeError (node:internal/errors:372:5)
    at ServerResponse.setHeader (node:_http_outgoing:576:11)
    at ServerResponse.header (/home/hahp1908/EShopAPI/node_modules/express/lib/response.js:794:10)
    at ServerResponse.send (/home/hahp1908/EShopAPI/node_modules/express/lib/response.js:174:12)
    at ServerResponse.json (/home/hahp1908/EShopAPI/node_modules/express/lib/response.js:278:15)
    at /home/hahp1908/EShopAPI/routes/auth.js:42:25
    at processTicksAndRejections (node:internal/process/task_queues:96:5) {
  code: 'ERR_HTTP_HEADERS_SENT'
}

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

router.post('/login', async (req, res) => {
    try{
        const user = await User.findOne(
            {
                username: req.body.user_name
            }
        );

        !user && res.status(401).json("Wrong User Name");

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


        const originalPassword = hashedPassword.toString(CryptoJS.enc.Utf8);

        const inputPassword = req.body.password;
        
        originalPassword != inputPassword && res.status(401).json("Wrong Password");
        res.status(200).json(user);
    }catch(err){
        res.status(500).json(err);
    }

});
module.exports = router

1 回复 | 直到 2 年前

ParadigmShift 2 年前

调用res.status()时,需要结束函数的执行。json(),否则它将继续,您将再次设置res.status()。json()。这是导致错误的原因。

修改为:

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

router.post('/login', async (req, res) => {
    try{
        const user = await User.findOne(
            {
                username: req.body.user_name
            }
        );

        if(!user) return res.status(401).json("Wrong User Name");

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


        const originalPassword = hashedPassword.toString(CryptoJS.enc.Utf8);

        const inputPassword = req.body.password;
        
        if(originalPassword != inputPassword) return res.status(401).json("Wrong Password");
        return res.status(200).json(user);
    }catch(err){
        return res.status(500).json(err);
    }

});
module.exports = router

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