一、 安装

npm install express --save
npm install body-parser  --save
npm install passport passport-jwt jsonwebtoken --save
npm install express --save
npm install ejs --save

二、passport-jwt策略

let jwtOptions = {};
jwtOptions.jwtFromRequest = ExtractJwt.fromAuthHeaderAsBearerToken();
jwtOptions.secretOrKey = 'jwt';

passport.use(new JwtStrategy(jwtOptions, (payload, done) => {
  // 获取 user 
  const user = {
    id: 1,
    username: 'admin',
    password: 'pass'
  }
  if (payload.username !== user.username) {
    return done(null, false, {message: 'incorrect username'});
  }
  if (payload.password !== user.password) {
    return done(null, false, {message: 'incorrect username'});
  }
  return done(null, user);
}));

passport.serializeUser((user, done) => {
  done(null, user)
});

passport.deserializeUser((user, done) => {
  done(null, user);
});

三、路由

// 路由
app.get('/', (req, res) => {
  res.render('index', {title: '登录面'})
});

app.post('/login', (req, res) => {
  // 获取user
  const user = req.body;
  // 验证user
  // ...

  // 验证成功
  const payload = {
    username: user.username,
    password: user.password
  }
  // 生成token
  const token = jwt.sign(payload, jwtOptions.secretOrKey, {
    expiresIn: 1000*60*60
  })
  res.json({
    token: 'Bearer '+token
  })
});

app.get('/user', passport.authenticate('jwt', {session: false}), (req, res) => {
  res.json({
    user: req.user.username
  })
});

app.get('/auth_jwt', (req, res) => {
  res.render('auth_jwt');
})

四、完整代码app.js

const express = require('express');
const ejs = require('ejs');
const bodyParser = require('body-parser');

const jwt = require('jsonwebtoken');
const passport = require('passport');
const passportJwt = require('passport-jwt');

const app = express();
// 策略
// ...

// 模板
app.set('view engine', 'ejs');
app.engine('ejs', ejs.renderFile);
// 中间件
app.use(express.static('public'));
app.use(bodyParser({
  extended: false
}))
app.use(passport.initialize());

// 路由
// ...

const server = app.listen(4000, () => {
  const host = server.address().address;
  const port = server.address().port;
  console.log(`app listening on：${host}:${port}`);
});