javascript - SyntaxError : Unexpected token u at Object. 为 JSON.parse() 解析( native )NodeJS

Question

我正处于 NodeJs 的学习阶段，我试图从 URL 中传递的 json 中获取参数值。我正在使用正文解析器，因为我看到许多堆栈溢出答案都使用它来解析数据。

下面是我传递的 URL，

http://localhost:1337/login?json={username:rv,password:password}

我收到下面提到的错误，

SyntaxError: Unexpected token u
at Object.parse (native)
at C:\Users\summer\Desktop\nodejs\practise3.njs:14:17
at Layer.handle [as handle_request] (C:\Users\summer\Desktop\nodejs\node_modules\express\lib\router\layer.js:95:5)
at next (C:\Users\summer\Desktop\nodejs\node_modules\express\lib\router\route.js:131:13)
at Route.dispatch (C:\Users\summer\Desktop\nodejs\node_modules\express\lib\router\route.js:112:3)
at Layer.handle [as handle_request] (C:\Users\summer\Desktop\nodejs\node_modules\express\lib\router\layer.js:95:5)
at C:\Users\summer\Desktop\nodejs\node_modules\express\lib\router\index.js:277:22
at Function.process_params (C:\Users\summer\Desktop\nodejs\node_modules\express\lib\router\index.js:330:12)
at next (C:\Users\summer\Desktop\nodejs\node_modules\express\lib\router\index.js:271:10)
at jsonParser (C:\Users\summer\Desktop\nodejs\node_modules\body-parser\lib\types\json.js:100:40)

代码如下，

var express = require('express');
var http = require('http');
var app = express();
var bodyparser = require('body-parser');

app.use(bodyparser.json());

app.get('/login',function(req,res,next){
    var content = '';
    var data = '';
    data = req.query.json;
    content = JSON.parse(data);        //I am getting the error here
    res.writeHead(200,{"Content-type":"text/plain"});
    res.write(data);
    res.end();
});

http.createServer(app).listen(1337);
console.log("Server Started successfully at Port 1337");

注意:读完这个问题后，如果您知道从 json 数据中收集值的其他替代方法，请告诉。

Answer 1

取而代之的是:

data = req.query.json;
content = JSON.parse(data);        //I am getting the error here

试试这个:

data = req.query.json;
var stringify = JSON.stringify(data)
content = JSON.parse(stringify);