javascript - 循环引用 block jsonwebtoken.sign 导致 JSON.stringify

Question

我正在使用 Express 和 Sequelize 进行基于 upon this tutorial 的基本用户身份验证

当我想向用户签署 token 时，我收到一条错误消息，告诉我我正在尝试 JSON.stringify() 一个无法完成的循环引用。因此抛出错误，我无法将 token 分配给用户。

OR 我在数据库中找到我的用户时做错了，这使循环引用 OR 我只需要找到一个解决方案来打破我想的循环引用.任何人都可以向我解释这两者中的哪一个？

完整的错误是:

TypeError: Converting circular structure to JSON
    at Object.stringify (native)
    at toString (/Users/Desktop/express-jwt/node_modules/jws/lib/tostring.js:9:15)
    at jwsSecuredInput (/Users/Desktop/express-jwt/node_modules/jws/lib/sign-stream.js:12:34)
    at Object.jwsSign [as sign] (/Users/Desktop/express-jwt/node_modules/jws/lib/sign-stream.js:22:22)
    at Object.module.exports [as sign] (/Users/Desktop/express-jwt/node_modules/jsonwebtoken/sign.js:144:16)
    at Model.User.findOne.then.user (/Users/Desktop/express-jwt/server/index.js:69:27)
    at Model.tryCatcher (/Users/Desktop/express-jwt/node_modules/bluebird/js/release/util.js:16:23)
    at Promise._settlePromiseFromHandler (/Users/Desktop/express-jwt/node_modules/bluebird/js/release/promise.js:510:31)
    at Promise._settlePromise (/Users/Desktop/express-jwt/node_modules/bluebird/js/release/promise.js:567:18)
    at Promise._settlePromise0 (/Users/Desktop/express-jwt/node_modules/bluebird/js/release/promise.js:612:10)
    at Promise._settlePromises (/Users/Desktop/express-jwt/node_modules/bluebird/js/release/promise.js:691:18)
    at Async._drainQueue (/Users/Desktop/express-jwt/node_modules/bluebird/js/release/async.js:138:16)
    at Async._drainQueues (/Users/Desktop/express-jwt/node_modules/bluebird/js/release/async.js:148:10)
    at Immediate.Async.drainQueues (/Users/Desktop/express-jwt/node_modules/bluebird/js/release/async.js:17:14)
    at runCallback (timers.js:574:20)
    at tryOnImmediate (timers.js:554:5)

我的服务器索引是:

const express = require(`express`);
const app = express();
const bodyParser = require(`body-parser`);
const morgan = require('morgan');

const jwt = require('jsonwebtoken'); // used to create, sign, and verify tokens
const config = require('./config'); // get our config file
const db = require(`./models`);
const User = global.db.User;

const port = process.env.PORT || 8080;

db.sequelize.sync().then(() => {
    console.log(`Express server listening on port ${port}`);
});

app.set('superSecret', config.secret);

app.use(bodyParser.urlencoded({extended: false}));
app.use(bodyParser.json());

app.use(morgan('dev'));

app.get('/', (req, res) => {
  res.send('Hello! The API is at http://localhost:' + port + '/api');
});

app.listen(port);
console.log('Magic happens at http://localhost:' + port);

app.get('/setup', (req, res) => {

  db.sequelize.sync().then(() => {
    return User.create({
      username: 'Kevin frafster',
      password: 'password',
      admin: true
    })
    .then(addedUser => {
      console.log(addedUser.get({
        plain: true
      }));
    })
    .catch(err => {
      res.json(err);
    });
  });

});

// API ROUTES -------------------

// get an instance of the router for api routes
const apiRoutes = express.Router();

apiRoutes.post('/authenticate', (req,res) => {
  User.findOne({
    where: {username: req.body.username}
  }).then(user => {
    if (!user) {
      res.json({ success: false, message: 'Authentication failed. User not found.'});
    }else{
      // console.log(user);
      if (user.password != req.body.password) {
        res.json({ success: false, message: 'Authentication failed. Wrong password.' })
      }else{

        const token = jwt.sign(user, app.get('superSecret'), {
          expiresIn: 60*60*24
        });

        res.json({
          succes: true,
          message: 'Enjoy your token!',
          token
        });
      }
    }
  }).catch(err => {
    res.status(500).json(err);
  })
});

// TODO: route to authenticate a user (POST http://localhost:8080/api/authenticate)

// TODO: route middleware to verify a token

// route to show a random message (GET http://localhost:8080/api/)
apiRoutes.get('/', (req, res) => {
  res.json({ message: 'Welcome to the coolest API on earth!' });
});

// route to return all users (GET http://localhost:8080/api/users)
apiRoutes.get('/users', (req, res) => {
  User.findAll({})
    .then(users => {
      res.json(users);
    })
    .catch(err => {
      res.json(err);
    });
});

// apply the routes to our application with the prefix /api
app.use('/api', apiRoutes);

Answer 1

好吧，答案完全是花生。

1) 创建新对象并为其分配负载

const payload = {username: user.username, password: user.password};

2) 使用新对象分配token给

const token = jwt.sign(payload, app.get('superSecret'), {
  expiresIn: 60*60*24
});