前言：
新建node-auth文件夹，新建server.js文件，初始化文件夹 npm init -y
(git init)
1.安装express, mongoose,rest-client
2.开启服务器
const express = require('express)
const app = express()
//连接数据库
require('./modles/db')
//jwt
const jwt = require('jsonwebtoken')
app.use(express.json())

//密钥const SECRET = 'sajkFAjscbhsafchdsvjkks';app.get('/api', async(req, res) => {    const user = await User.find();    res.send(user);    // res.send('ok');})//注册app.post('/api/register', async(req, res) => {    const user = await User.create({        username: req.body.username,        password: req.body.password    })    res.send(user);    // console.log(req.body);});//登录app.post('/api/login', async(req, res) => {    const user = await User.findOne({ username: req.body.username });    if (!user) {        return res.status(422).send({            message: '用户名不存在'        })    }    //验证密码 compareSync    const isPasswordValid = require('bcryptjs').compareSync(req.body.password, user.password);    if (!isPasswordValid) {        return res.status(422).send({            message: '密码错误'        });    }    // 生成token    const token = jwt.sign({        id: String(user._id)    }, SECRET)    res.send({            user,            token        })        // res.send(isPasswordValid);        // res.send(user);});// 中间件const auth = async(req, res, next) => {//获取token    const raw = String(req.headers.authorization.split(' ').pop());    //解析    const { id } = jwt.verify(raw, SECRET);    req.user = await User.findById(id);    next()}// 个人信息app.get('/api/profile', auth, async(req, res) => {    res.send(req.user);})app.listen(3000, () => {`    console.log('listening port 3000!');})

3.连接数据库

/*ps:var bcrypt = require('bcryptjs');生成var salt = bcrypt.genSaltSync(10);var hash = bcrypt.hashSync("....", salt);//比较bcrypt.compareSync("....", hash); //一步到位var hash = bcrypt.hashSync('...', 8);*/const mongoose = require('mongoose')mongoose.connect('mongodb://localhost:27017/database', {    new useNewUrlParser: true,    useUnifiedTopology: true,    useCreateIndex: true})const userSchema = new mongoose.Schema({    username: {        type: String,        //唯一性        unique: true    },    password: {        type: String,        // 加密bcrypt        set(val) {            return require('bcryptjs').hashSync(val, 10);        }    }})const User = mongoose.model('User', userSchema)module.exports = {User}

4.新建test.http （类似于postman）

@url=http://localhost:3001/api@json= Content-Type: application/json###get {{url}}### 注册post {{url}}/register{{json}}{    "username": "admin4",    "password": "1234568"}### 登录post {{url}}/login{{json}}{    "username": "admin2",    "password": "1234568"}### 个人信息get {{url}}/profileAuthorization: Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpZCI6IjVlZGZiYWI1MDc3OTU4MTA0MDkyMjU4ZiIsImlhdCI6MTU5MTc1NDYxNX0.bg2JDwigQ5jYg-nOdNUENjJS80y1KmZySjZDhXpvmTM