我一直在学习有关JWT的知识，我遇到的问题是响应以JsonWebTokenError形式给出。令牌生成工作正常。但是令牌的验证给我一个错误，指出“ JsonWebTokenError”和消息“无效签名”。这是我的代码

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

const app = express();

app.get('/api',(request,response) => {
    response.json({
        message: 'This is an Authentication API'
    })
})

app.post('/api/posts',verifyToken,response) => {
    jwt.verify(request.token,'secretkey',(err,authData) => {
        if(err){
            response.json({err});
        }
        else{
            response.json({
                message: 'Post was created successfully',authData
            })
        }
    })

})

app.post('/api/login',response) => {
    const user = {
        id: 1,user: 'sarath',email: 'sarathsekaran@gmail.com'
    }

    jwt.sign({user},'secretKey',token) => {
       response.json({
        token
        }); 
    });
});

//VerifyToken
//Authori FORMAT: Bearer <token>

function verifyToken(request,response,next){
//Get auth header value
const bearerHeader = request.headers['authorization'];
//Checking if bearer is undefined
    if(typeof bearerHeader !== 'undefined'){
        //Spilt the token from Bearer
        const bearer = bearerHeader.split(' ');
        const bearerToken = bearer[1];
        //Set the token
        request.token = bearerToken;
        //Next Middleware
        next();
    }
    else{
        //Forbidden
        response.sendStatus(403);

    }
}

app.listen(5000,()=>console.log('Server Started'));