javascript 使用 JsonWebToken 时遇到问题；JsonWebToken 错误：必须提供 JWT
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Having trouble with JsonWebToken; JsonWebToken Error: JWT must be provided
提问by HelloWorld
I'm building my first SPA project with Vue.
我正在用 Vue 构建我的第一个 SPA 项目。
I decided to go with NodeJS for the back-end, however, I'm having a headache building the login function with the JsonWebToken.
我决定使用 NodeJS 作为后端，但是，我在使用 JsonWebToken 构建登录功能时遇到了麻烦。
I had wrote some codes to see how JWT works and when I tried to see how JWT gets verified, server gave me an error.
我写了一些代码来了解 JWT 是如何工作的，当我试图了解 JWT 如何被验证时，服务器给了我一个错误。
JsonWebTokenError: jwt must be provided
at Object.module.exports [as verify] (c:\dir\node_modules\jsonwebtoken\verify.js:39:17)
at c:\projects\practice\demo\back\server.js:34:17
Below is the code for my server.js
下面是我的 server.js 的代码
This is the code for importing the stuff.
这是导入东西的代码。
const express = require('express');
const jwt = require('jsonwebtoken');
const bodyParser = require('body-parser');
const api = express();
api.use(bodyParser.json());
api.use(bodyParser.urlencoded({ extended: true }));
This is for the API for issuing JWT.
这是用于发布 JWT 的 API。
api.post('/secure', function (req, res) {
const token = jwt.sign({ user: {id:1, name:'ME!', role: 'average'} }, 'dsfklgj');
console.log(token);
res.json({jwt: token});
});
This is the API for checking JWT.
这是用于检查 JWT 的 API。
api.post('/check/post', function (req, res) {
const token = req.body.jwt;
const x = jwt.verify(token, 'dsfklgj', function (err, decoded) {
if (err) throw err;
console.log(decoded);
});
if (x != true) {
res.json({ auth: false });
}else {
res.json({ auth: true });
}
});
回答by Mohammad Rajabloo
jwt must be provided
必须提供 jwt
This error happens when the coming token is null or empty.
当即将到来的令牌为空或空时，会发生此错误。
回答by mabc224
It may be you have not defined jwtin specific file or it is null or empty. Therefore you are getting an error. I just test your code and it works for me. It may be that you are not sending jwttoken into post request correctly.
可能是您没有jwt在特定文件中定义或者它为空或空。因此，您收到错误消息。我只是测试你的代码，它对我有用。可能是您没有jwt正确地将令牌发送到 post 请求中。
const express = require('express');
const jwt = require('jsonwebtoken');
const bodyParser = require('body-parser');
const http = require('http');
const api = express();
api.use(bodyParser.json());
api.use(bodyParser.urlencoded({ extended: true }));
api.post('/secure', function(req, res) {
const token = jwt.sign({ user: { id: 1, name: 'ME!', role: 'average' } }, 'dsfklgj');
console.log(token);
res.json({ jwt: token });
});
api.post('/check/post', function(req, res) {
const token = req.body.jwt;
console.log('token: ' + token);
const x = jwt.verify(token, 'dsfklgj', function(err, decoded) {
if (err) throw err;
console.log(decoded);
});
console.log(x);
if (x != true) {
res.json({ auth: false });
} else {
res.json({ auth: true });
}
});
api.set('port', 3000);
var server = http.createServer(api);
server.listen(api.get('port'), function() {
console.log("Express server listening on port " + api.get('port'));
});
BTW there is no way to test it like like this const x = jwt.verify(token, 'dsfklgj', function (err, decoded) {. Either write it in Syncway or check condition in asynccallback function. In your case, xwill be undefinedand no guarantee when it will run.
顺便说一句，没有办法像这样测试它const x = jwt.verify(token, 'dsfklgj', function (err, decoded) {。以Sync方式编写或在async回调函数中检查条件。在您的情况下，x将undefined不会保证何时运行。
