在尝试验证令牌时出现问题（在生成令牌之前，在我向令牌添加一些数据之前，令牌工作正常）..但现在它似乎不工作了！
这是当用户发送POST请求（登录）时我生成令牌的方式

require('dotenv')
const jwt       = require('jsonwebtoken');
const bcrypt    = require('bcryptjs')
const Role      = require('../models/Role');
const Section   = require('../models/Section');
const User      = require('../models/User');

// Login !
router.post('/', async (req, res) => {

    let sections_fetched = [];

    // Validate data 

    // Check username
    const user = await User.findOne({username: req.body.username });
    if(!user) return res.status(400).send('Wrong user login credentials !');

    // Check password
    const is_pass_valid = await bcrypt.compare(req.body.password , user.password);
    if (!is_pass_valid) return res.status(400).send('Wrong user login credentials !');

    // Get role Object:
    const _role = await Role.findOne({_id:user.role , is_deleted:false});
    if (!_role) res.json("Failed fetching role !");

    // loop through sections   
    for (let index = 0; index < _role.sections.length; index++) {

        const tmpRole = await Section.find({_id: _role.sections[index], is_deleted:false});
        sections_fetched.push({access:tmpRole[0].access , name:tmpRole[0].name});
    }

    // create jwt token
    const token = jwt.sign({username:user.username, role:{name:_role.name, sections:sections_fetched}}, 'secret', {expiresIn : '24h'}, process.env.JWT_TOKEN_SECRET);
    res.json({token:token});

});

这是我JWT验证中间件：

require('dotenv')
const jwt = require('jsonwebtoken');

module.exports = function (req, res, next) {

    const token = req.header('auth-token');

    if (!token) return res.status(401).send('Access Denied !');
    console.log(process.env.JWT_TOKEN_SECRET);
    console.log(token);

    try 
    {

        const verified = jwt.verify(token, process.env.JWT_TOKEN_SECRET);
        req.user = verified;  
        next();

    } 
    catch (error) 
    {
        res.status(400).send('Invalid token !');
    }
}

这是一个列出用户的简单示例（使用JWT验证中间件！）：

const verifyToken = require('../middlewares/verifyToken'); // my jwt middleware to verify !

// Listing All users
router.get('/', verifyToken, async (req, res) => 
{
    try 
    { 
        const users = await User.find({is_deleted:false});
        res.json(users);
    }
    catch (error) 
    {
        console.log("err ->\n"+error);
        res.json({message: error});
    } 
});