UnhandledPromiseRejectionWarning：需要数据和盐参数

Question

问题： 我在尝试注册新用户时一直收到标题错误仅在使用邮递员时不知道为什么。

此外，代理问题：无法代理请求 /api/auth/register?hello&world 从 localhost:3000 到 http://localhost:8080/.

我尝试通过代理解决的事情是在包 json.

中添加 "secure": false

我的auth.js文件：

exports.postRegister = async (req, res, next) => {
  // User object
  const newUser = {
    username: req.body.username,
    password: req.body.password,
  };
  // Check if user exists
  try {
    const user = await User.findOne({ username: newUser.username });
    if (user) {
      const error = new Error("Username already taken.");
      error.statusCode = 422;
      return next(error);
    }
  } catch (error) {
    error.statusCode = error.statusCode || 500;
    next(error);
  }

  // creating a hash from the given password
  bcrypt.genSalt(12, (err, salt) => {
    if (err) {
      return next(err);
    }
    bcrypt.hash(newUser.password, salt, null, async (err, hash) => {
      if (err) {
        return next(err);
      }
      try {
        // set hashed password as the password field in newUser object.
        newUser.password = hash;

        // Save newUser
        const createdUser = new User(newUser);
        await createdUser.save();

        // Create jwt token and send
        const token = await genToken(createdUser._id, createdUser.username);
        res.status(201).json({
          success: true,
          token,
        });
      } catch (err) {
        err.statusCode = err.statusCode || 500;
        next(err);
      }
    });
  });
};

Server.js 文件:

const express = require("express");
const mongoose = require("mongoose");
const bodyParser = require("body-parser");
const helmet = require("helmet");
const cors = require("cors");

require("dotenv").config();

const mailRoutes = require("./routes/mail");
const authRoutes = require("./routes/auth");

const app = express();

app.use(bodyParser.json());
app.use(helmet());
app.use(cors());

// Routes
app.use("/api/mail", mailRoutes);
app.use("/api/auth", authRoutes);

app.use((error, req, res, next) => {
  console.log(error.message);
  res.status(error.statusCode).json({
    error: true,
    messages: [error.message],
  });
});

mongoose.connect(process.env.DB_URI, (err) => {
  if (err) {
    console.log(err);
  } else {
    console.log("DB Connected");
  }
});

const PORT = process.env.PORT || 5000;

app.listen(PORT, () => {
  console.log(`Server has started at ${PORT}`);
});

Answer 1

好的，对于面临同样问题的任何人 - 我已经解决了。从箭头函数更改为常规函数。显然 bcrypt 不接受箭头函数

所以代替：

bcrypt.hash(newUser.password, salt, async => (err, hash){}...

这样做：

bcrypt.hash(newUser.password, salt, async function (err, hash){}...

UnhandledPromiseRejectionWarning：需要数据和盐参数

UnhandledPromiseRejectionWarning: data and salt arguments required

javascript

authentication

bcrypt

express

reactjs