获取和发布请求继续在邮递员/浏览器中加载

Question

我正在使用邮递员测试我的 API。我正在从邮递员发送 get 和 post 请求，但它一直说正在发送，没有错误也没有响应。请告诉我如何调试我的代码。 附言: 我是后端开发新手。

App.js 文件：

const express = require("express");
const app = express();
const morgan = require('morgan');
const mongoose = require('mongoose');
const cors = require('cors');
require('dotenv').config({ path: '.env' });

app.use(cors);
app.options('*', cors());

//Middleware
app.use(express.json());
app.use(morgan('tiny'));

//Routes
const productsRoutes = require('./routers/products');
const categoriesRoutes = require('./routers/categories');

const api = process.env.API_URL;
app.use(`${api}/products`, productsRoutes);
app.use(`${api}/categories`, categoriesRoutes);


//Database
mongoose.connect(process.env.CONNECTION_STRING, { useNewUrlParser: true, useUnifiedTopology: true})
.then(()=>{
    console.log('Database connection is ready');
})
.catch((err)=>{
    console.log(err);
});

//Server
app.listen(3000, ()=>{
    console.log("Server is running on http://localhost:3000");
});

category.js（类别架构）：

const mongoose = require('mongoose');

const categorySchema = mongoose.Schema({
    name :{
        type :String,
        required : true
    }, 
    icon :{
        type : String,
    },
    color :{
        type : String,
    }
})

exports.Category = mongoose.model('Category', categorySchema);

categories.js

const {Category} = require('../models/category');

const express = require('express');
const router = express.Router();

router.get('/', async(req, res) =>{
    const categoryList = await Category.find();
    if(!categoryList){
        res.status(500).json({success: false})
    }
    res.stauts(200).send(categoryList);
})

router.post('/', async(req, res) =>{
    const category = new Category({
        name: req.body.name,
        icon: req.body.icon,
        color: req.body.color
    });
    category = await category.save();
    if(!category)
    return res.status(404).send('The category cannot be created');
    res.send(category);
})

module.exports = router;

邮递员不断发送请求：

Answer 1

app.js 中的语法错误：app.use(cors); 正确：app.use(cors());