尝试访问节点js中的req.user属性时，无法读取未定义的属性“用户名”

我正在使用MEAN堆栈。 我想要访问req.user属性。 但是我得到一个错误，说当我尝试显示当前用户的用户名时， 不能读取未定义的属性“用户名” 。 我回到了一些网站。 https://www.airpair.com/express/posts/expressjs-and-passportjs-sessions-deep-dive

类似的问题Node + Express + Passport：req.user未定义

有人提到中间件function的顺序很重要。 我纠正了这些。 我仍然得到同样的错误。 我的错误是什么？

app.js

var express = require('express'); var path = require('path'); var favicon = require('serve-favicon'); var logger = require('morgan'); var cookieParser = require('cookie-parser'); var bodyParser = require('body-parser'); var mongo = require('mongodb'); var mongoose = require("mongoose"); var expressValidator = require('express-validator'); var flash = require('connect-flash'); var session = require('express-session'); var passport = require('passport'); var LocalStrategy = require('passport-local').Strategy; var ConnectRoles = require('connect-roles'); var User = require('./models/user'); mongoose.connect("mongodb://localhost:27017/test"); var db = mongoose.connection; db.on("error", console.error.bind(console, "Connection error:")); db.once("open", function(callback){ console.log("Connection Succeeded."); }); var routes = require('./routes/Login'); var admin = require('./routes/AdminDatabase'); var survey = require('./routes/CreateSurvey'); var submit = require('./routes/SubmitSurvey'); var app = express(); app.set('views', path.join(__dirname, 'views')); app.set('view engine', 'ejs'); app.use(logger('dev')); app.use(express.static(path.join(__dirname, 'public'))); app.use(cookieParser()); app.use(bodyParser.json()); app.use(bodyParser.urlencoded({ extended: false })); app.use(session({ secret: 'secret', saveUninitialized: true, resave: true })); app.use(passport.initialize()); app.use(passport.session()); app.use(flash()); app.use(function (req, res, next) { res.locals.success_msg = req.flash('success_msg'); res.locals.error_msg = req.flash('error_msg'); res.locals.error = req.flash('error'); res.locals.user = req.user || null; next(); }); app.use('/', routes); app.use('/AdminDatabase', admin); app.use('/CreateSurvey', survey); app.use('/SubmitSurvey', submit); app.use(function(req, res, next) { var err = new Error('Not Found'); err.status = 404; next(err); }); if (app.get('env') === 'development') { app.use(function(err, req, res, next) { res.status(err.status || 500); res.render('error', { message: err.message, error: err }); } app.use(function(err, req, res, next) { res.status(err.status || 500); res.render('error', { message: err.message, error: {} }); }); app.get('/AdminDatabase', function(req, res){ user.find({}, function(err, profile){ res.render('AdminDatabase', {profile:profile}); }); }); module.exports = app; 

Login.js（我有护照和路线）

 var express = require('express'); var router = express.Router(); var passport = require('passport'); var LocalStrategy = require('passport-local').Strategy; var User = require('../models/user'); var ConnectRoles = require('connect-roles'); router.get('/', function(req, res, next) { res.render('Login', { title: 'Login' }); }); passport.serializeUser(function(user, done) { done(null, user._id); }); passport.deserializeUser(function(id, done) { User.findById(id, function(err, user) { done(err, user); }); }); passport.use("/", new LocalStrategy( function(username, password, done) { User.findOne({ username: username }, function(err, user) { if (err) { return done(err); } if (!user) { return done(null, false, { message: "No user has that username!" }); } user.checkPassword(password, function(err, isMatch) { if (err) { return done(err); } if (isMatch) { return done(null, user); } else { return done(null, false,{ message: "Invalid password." }); } }); }); })); router.use(function(req, res, next) { res.locals.currentUser = req.user; res.locals.errors = req.flash("error"); res.locals.infos = req.flash("info"); next(); }); router.post("/", passport.authenticate("/", { successRedirect: "/SubmitSurvey", failureRedirect: "/", session: false, failureFlash: true })); router.get("/AdminDatabase", function(req, res) { res.render('AdminDatabase', { title: 'AdminDatabase' }); }); router.get('/CreateSurvey', function(req, res, next) { res.render('CreateSurvey', { title: 'CreateSurvey' }); }); router.get('/SubmitSurvey', function(req, res, next) { res.render('SubmitSurvey', { title: 'SubmitSurvey' }); }); router.get('/profile', function(req, res){ var user= res.user; res.render('profile', { title: 'profile', user: user }); }); router.get("/Logout", function(req, res) { req.logout(); res.redirect("/"); }); module.exports = router; 

Answer 1

我无法看到你用express.js初始化你的passport.js

您应该将其添加为中间件

  app.use(passport.initialize()) app.use(passport.session()) 

这应该会对你有所帮助 如果它没有帮助你，请看看这个例子。 https://blog.risingstack.com/node-hero-node-js-authentication-passport-js/

Answer 2

我不知道你的客户端是如何发送它的数据，无论是身体还是QS …但是要从服务器端访问这些信息，你需要做如下的事情：

 req.params.user 

要么

 req.body.user 

使用req.user将永远是undef，因为对请求对象没有这样的属性。