无法在 NodejJS 中使用 JWT 访问受保护的路由

问题描述

我正在尝试使用 jwt 保护应用程序路由。我能够生成 jwt 并验证 jwt 我已经创建了中间件 authorize.js，我将其传递给 /sec > 在下面的代码中路由，但是当我尝试使用 jwt 访问受保护的路由时，它显示以下错误：

Error [ERR_HTTP_HEADERS_SENT]: Cannot set headers after they are sent to the client
at ServerResponse.setHeader (_http_outgoing.js:518:11)
at ServerResponse.header (D:\Backend\NodeJs\aws_test\node_modules\express\lib\response.js:771:10)
at ServerResponse.send (D:\Backend\NodeJs\aws_test\node_modules\express\lib\response.js:170:12)
at ServerResponse.json (D:\Backend\NodeJs\aws_test\node_modules\express\lib\response.js:267:15)
at D:\Backend\NodeJs\aws_test\server.js:24:9
at Layer.handle [as handle_request] (D:\Backend\NodeJs\aws_test\node_modules\express\lib\router\layer.js:95:5)
at next (D:\Backend\NodeJs\aws_test\node_modules\express\lib\router\route.js:137:13)
at D:\Backend\NodeJs\aws_test\auth.js:21:20
at Object.module.exports [as verify] (D:\Backend\NodeJs\aws_test\node_modules\jsonwebtoken\verify.js:53:12)
at authorize (D:\Backend\NodeJs\aws_test\auth.js:11:13)

以下是我在 POSTMAN 中设置 jwt 的方法：

下面是我的代码：

server.js

const express = require('express');
const jwt = require('jsonwebtoken');
const authorize = require('./auth');
const chalk = require('chalk');

const app = express();

const port = 3000 || process.env.PORT;

app.get('/',(req,res) => {

   res.send("Home page");
});

app.get('/jwt',res) => {

   let token = jwt.sign({"body":"stuff"},"mypassphrase",{ algorithm: 'HS256'});
   console.log(chalk.blue(token));
});

app.get('/sec',authorize,res) => {

   res.json({"name":"Hello digi"});
});

app.listen(port,res) => {

  console.log(chalk.green(`App is running at ${port}`));
});

auth.js

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

authorize = (req,res,next) => {

  if(typeof req.headers.authorization !== "undefined"){

      let token = req.headers.authorization.split(" ")[1];
      let key = fs.readFileSync('./private.pem','utf-8');

      jwt.verify(token,key,{ algorithm: "HS256" },(err,user) => {

         if (err) {  
            // shut them out!
            res.json({ error: "Not Authorized" });
           // throw new Error("Not Authorized");
         }
          // if the JWT is valid,allow them to hit
         // the intended endpoint
          return next();
       });
  }
 else{

    // No authorization header exists on the incoming
    // request,return not authorized and throw a new error 
    res.json({ error: "No Authorization header" });
   // throw new Error("Not Authorized");

    }    
}

module.exports = authorize;

我在上面的代码中做错了什么或需要正确的地方。

解决方法

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express express-jwt