node.js表達req.body未定義

var express = require('express'); 
var app = express(); 
var PORT = 3000; 

const bodyParser = require('body-parser')
app.use(bodyParser.json())
app.use(bodyParser.urlencoded({extended: true}));
 
app.post('/', function (req, res) { 
  console.log(req.body); 
  console.log(req.body.username);
  res.end(); 
}); 

app.listen(PORT, function(err){ 
  if (err) console.log(err); 
  console.log("Server listening on PORT", PORT); 
});

郵遞員測驗： Post: http://localhost:3000 { "username":"userabc", "password":"passwd1234" }

但是，結果是：{} undefined

uj5u.com熱心網友回復：

嘗試在請求正文中設定 Content-Type: application/json

uj5u.com熱心網友回復：

您需要在請求中將 Content-Type 設定為 application/json。

uj5u.com熱心網友回復：

您撰寫代碼的方式是非常樂觀的方式，如果有人不提供正文可能會導致錯誤，在 api 中進行一些驗證了解事物。

請將代碼僅作為參考實作。這是您需要將其匯入 app.js 或 index.js 模塊的代碼的路由器部分

import express from "express";

import { Request, Response } from "express";
import { body, validationResult } from "express-validator";
import { BadRequestError } from "@omerkiani/common";
import { RequestValidationError } from "@omerkiani/common";
import { User } from "../models/user";
import { validateRequest } from "@omerkiani/common";
import { Password } from "../services/password";
import jwt from "jsonwebtoken";
import { requireAuth } from "@omerkiani/common";
import { currentUser } from "@omerkiani/common";

const router = express.Router();


router.post(
  "/api/users/signup",
  [
    body("email").isEmail().withMessage("Email must be valid"),
    body("password")
      .trim()
      .isLength({ min: 4, max: 20 })
      .withMessage("Password must be between 4 and 20 characters"),
  ],
  async (req: Request, res: Response) => {
    const errors = validationResult(req);

    if (!errors.isEmpty()) {
      throw new RequestValidationError(errors.array());
    }
    console.log("Creating a user...");
    const { email, password } = req.body;
    const exiting = await User.findOne({ email });
    if (exiting) {
      console.log("Email already in use");
      throw new BadRequestError("Email already in use");
    }


    const user = User.build({ email, password });
    await user.save();


    //Generate Json Web Token
    const userJwt = jwt.sign({ id: user.id, email: user.email }, process.env.JWT_KEY!);
    req.session = {jwt: userJwt};
    //End


    res.status(201).send(user);
  }
);

router.post(
  '/api/users/signin',
  [
    body('email')
      .isEmail()
      .withMessage('Email must be valid'),
    body('password')
      .trim()
      .notEmpty()
      .withMessage('You must supply a password')
  ],
  validateRequest,
  async (req: Request, res: Response) => {
    const { email, password } = req.body;

    const existingUser = await User.findOne({ email });
    if (!existingUser) {
      throw new BadRequestError('Invalid credentials');
    }

    const passwordsMatch = await Password.compare(
      existingUser.password,
      password
    );
    if (!passwordsMatch) {
      throw new BadRequestError('Invalid Credentials');
    }

    // Generate JWT
    const userJwt = jwt.sign(
      {
        id: existingUser.id,
        email: existingUser.email
      },
      process.env.JWT_KEY!
    );

    // Store it on session object
    req.session = {
      jwt: userJwt
    };

    res.status(200).send(existingUser);
  }
);

router.post('/api/users/signout', (req, res) => {
  req.session = null;

  res.send({});
});


router.get('/api/users/currentuser', currentUser, (req, res) => {
  res.send({ currentUser: req.currentUser || null });
});


export { router as AuthRouter };

index.js 檔案如下所示

import express from "express";
import cookieSession from 'cookie-session';
import "express-async-errors";
import { AuthRouter } from "./routes/auth_router";
import { errorHandler } from "@omerkiani/common";
import { NotFoundError } from "@omerkiani/common";

import mongoose from "mongoose";
const app = express();
app.set('trust proxy', true);
app.use(express.json());
app.use(cookieSession({
  signed: false,
  secure: true
}));

app.use(AuthRouter);
app.use(errorHandler);


app.all("*", async (req, res) => {
  throw new NotFoundError();
});

const start = async () => {

  if (!process.env.JWT_KEY) {
    throw new Error("JWT Key Should be Defined");
  }

  if (!process.env.MONGO_URI) {
    throw new Error("Mongo URI Should be Defined");
  }

  try {
    await mongoose.connect(process.env.MONGO_URI!, {});
    console.log("Connected to MongoDB");
  } catch (err) {
    console.error(err);
  }
};


app.listen(3000, () => {
  console.log("Auth Up on Port 3000!");
});

start();

uj5u.com熱心網友回復：

您是如何設定 Postman 正文請求的？

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