我需要一些帮助,因为我是 Node.js 和 Express 的新手。我正在 Postman 上测试以下代码
const Joi = require('@hapi/joi');
const bodyParser = require('body-parser');
// Load the express framework
const express = require('express');
const app = express();
app.use(express.json());
app.use(bodyParser.json());
app.use(express.urlencoded({ extended: true }));
// temp array
const courses = [
{id: 1, title: 'Learning Node.js'},
{id: 2, title: 'How to become a full stack dev'},
{id: 3, title: 'Master your Javascript skills'}
];
app.post('/api/courses', (request, response) => {
let error = validateCourse(request.body);
if (error) {
response.status(400).send(error.details[0].message); // *
return;
}
let course = {
id: courses.length + 1,
name: request.body.name
};
// TODO save
console.log('TODO save the record');
response.send(course);
});
app.put('/api/courses/:id', (request, response) => {
let course = courses.find(c => c.id === parseInt(request.params.id));
if(!course) response.status(404).send('Oops!');
let { error } = validateCourse(request.body);
if (error) {
response.status(400).send(error.details[0].message);
return;
}
// TODO save
console.log('TODO save the record');
response.send(course);
});
function validateCourse(course) {
let schema = Joi.object({
name: Joi.string().min(4).required()
});
console.log(course);
return schema.validate(course);
}
当我发出 PUT 或 POST 请求时,我在其中提供name
(即验证应该通过)我收到 400 错误。
在 POST 请求中,我在控制台中看到以下内容,它指的是我的星号 (*) 所在的位置
TypeError: Cannot read property '0' of undefined
at /app/index.js:50:48
根据 PUT 请求,我在控制台中看到以下内容Error [ERR_HTTP_HEADERS_SENT]: Cannot set headers after they are sent to the client
在这两种情况下,我在 validateCourse 函数中的 console.log 显示一个空对象{}
This is a screenshot from postman
有什么想法我做错了吗?