Javascript SyntaxError: JSON.parse() 的 Object.parse（本机）NodeJS 处的意外标记 u
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SyntaxError: Unexpected token u at Object.parse (native) NodeJS for JSON.parse()
提问by rv.
I am in the learning stages of NodeJs and I was trying to get values of parameters from the json passed in the URL. I am using body parser because i saw many stack overflow answers using the same to parse through the data.
我正处于 NodeJs 的学习阶段，我试图从 URL 中传递的 json 中获取参数的值。我正在使用正文解析器，因为我看到许多堆栈溢出答案使用相同的方法来解析数据。
Below is the URL I am passing,
下面是我传递的网址，
http://localhost:1337/login?json={username:rv,password:password}
I am getting the error mentioned below,
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)
The code is mentioned below,
代码在下面提到，
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");
Note: After reading this question, if you know other alternatives for collecting values from json data, please do tell.
注意：阅读此问题后，如果您知道从 json 数据中收集值的其他替代方法，请务必告知。
回答by Subburaj
Instead of this:
取而代之的是：
data = req.query.json;
content = JSON.parse(data); //I am getting the error here
Try for this:
试试这个：
data = req.query.json;
var stringify = JSON.stringify(data)
content = JSON.parse(stringify);
回答by BenC
JSON.parseis choking because unlike Javascript, JSON requires all key names to be in quotes [0], so your JSON should be
JSON.parse令人窒息，因为与 Javascript 不同，JSON 要求所有键名都用引号 [0] 括起来，因此您的 JSON 应该是
{"username":rv,"password":password}
The error "Unexpected token u..." is occurring when the JSON parser encounters the "u" at the beginning of "username", when it expected a quotation mark.
当 JSON 解析器在“用户名”开头遇到“u”时，会发生错误“意外的令牌 u...”，而它需要引号。
[0] There is a very readable summary of the JSON spec at http://json.org.
[0] http://json.org 上有一个非常易读的 JSON 规范摘要。
回答by Hari Das
This happens because the key name must be enclosed within double quotes. Here is a workaround to overcome this issue:
发生这种情况是因为键名必须用双引号括起来。以下是解决此问题的解决方法：
var jsonObj = eval('(' + YOUR_JSON_STRING + ')');
