javascript Node.js express.json 中间件未按预期解析请求
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Node.js express.json middleware not parsing request as expected
提问by akaphenom
I have a simple cURL (i think this is right) that posts a small JSON object to my express server:
我有一个简单的 cURL（我认为这是正确的），它将一个小的 JSON 对象发布到我的快速服务器：
curl -d "{'test': 'this'}" localhost:3000/rest/user/authenticate
I have express set up as:
我已将快递设置为：
// set up body parsing in express to be able to get parse JSON posts
server.use(express.json());
server.use(express.urlencoded());
and have handler that accepts the route:
并有接受路线的处理程序：
JSON = require('JSON')
module.exports = {
authenticateUser: function create(req, res){
var postedObject = req.body
console.log(postedObject)
res.send('Handle Post: authenticateUser');
}
}
the handler is getting called, but it is logging the JSON body unexpectedly:
处理程序正在被调用，但它意外地记录了 JSON 正文：
{ '{\'test\': \'this\'}': '' }
So my entire object looks to be the name side of a JSON Name:Value pair object. no matter what I post it seems to be appending the value side. Unless I do something like this:
所以我的整个对象看起来是 JSON Name:Value 对对象的名称端。无论我发布什么，它似乎都在附加价值方面。除非我做这样的事情：
curl -d "a=a" localhost:3000/rest/user/authenticate
which logs:
其中日志：
{'a':'a'}
so have i not set the right headers? Configured express wrong? I plan on digging through the express code, but wondered if somebody might know before I find the solution. Either way having a searchable/indexed answer to this on the web will be nice.
所以我没有设置正确的标题吗？配置express错了吗？我计划深入研究快速代码，但想知道在我找到解决方案之前是否有人可能知道。无论哪种方式，在网络上对此都有一个可搜索/索引的答案都会很好。
update 1
更新 1
ok I need to add the header to the cURL
好的，我需要将标题添加到 cURL
curl -H "Content-Type: application/json" -d "{'test': 'this'}" localhost:3000/rest/user/authenticate
which gives the error:
这给出了错误：
Parsing: {'test': 'this'}
SyntaxError: Unexpected token '
at Object.parse (native)
at C:\blah\node_modules\express\node_modules\connect\lib\middleware\json.js:86:19
at IncomingMessage.onEnd (C:blah\node_modules\express\node_modules\connect\node_modules\raw-body\index.js:109:7)
at IncomingMessage.g (events.js:180:16)
at IncomingMessage.EventEmitter.emit (events.js:92:17)
at _stream_readable.js:920:16
at process._tickCallback (node.js:415:13)
OR curl -H "Content-Type: application/json" -d "{test: 'this'}" localhost:3000/rest/user/authenticate
或 curl -H "Content-Type: application/json" -d "{test: 'this'}" localhost:3000/rest/user/authenticate
which gives the error:
这给出了错误：
Parsing: {test: 'this'}
SyntaxError: Unexpected token t
at Object.parse (native)
at C:\blah\node_modules\express\node_modules\connect\lib\middleware\json.js:86:19
at IncomingMessage.onEnd (C:blah\node_modules\express\node_modules\connect\node_modules\raw-body\index.js:109:7)
at IncomingMessage.g (events.js:180:16)
at IncomingMessage.EventEmitter.emit (events.js:92:17)
at _stream_readable.js:920:16
at process._tickCallback (node.js:415:13)
update 2
更新 2
in the file connect/lib/middleware/json.js
在文件 connect/lib/middleware/json.js
this line seems to be the one causing issues
这条线似乎是导致问题的原因
req.body = JSON.parse(buf, options.reviver);
update 3
更新 3
I really think it is my cURL
我真的认为这是我的 cURL
buf= JSON.stringify({test: 'This'});
console.log(buf)
req.body = JSON.parse(buf, options.reviver);
works logging first {"test":"this"}
首先记录工作 {"test":"this"}
and then in my handler:
然后在我的处理程序中：
----------------------
{ test: 'this' }
----------------------
回答by Oleg
1) JSON middleware only works if the request has Content-Type: application/jsonheader.
2) Valid JSON should contain ", not '.
So it should be '{"test": "this"}'instead of "{'test': 'this'}"
1) JSON 中间件仅在请求具有Content-Type: application/json标头时才有效。
2) 有效的 JSON 应该包含"，而不是'.
所以它应该'{"test": "this"}'代替"{'test': 'this'}"
Try this command:
试试这个命令：
curl -d '{"test": "this"}' -H "Content-Type: application/json" localhost:3000/rest/user/authenticate
回答by akaphenom
THe answer has two pieces
答案有两部分
- add the content header
on windows go through the pain of passing the json correctly, cURL on my windows machine doesn't deal with interchanging the single and double quotes , therefore the proper cURL is
curl -H "Content-Type: application/json" -d "{"""test""": """this"""}" localhost:3000/rest/user/authenticate
- 添加内容标题
在 Windows 上经历了正确传递 json 的痛苦，我的 Windows 机器上的 cURL 不处理交换单引号和双引号，因此正确的 cURL 是
curl -H "Content-Type: application/json" -d "{"""test""": """this"""}" localhost:3000/rest/user/authenticate
Yup, inside of the data parameter, you need to use three double quotes to send a single double quote to the server.
是的，在 data 参数内部，您需要使用三个双引号将单个双引号发送到服务器。
Accepting zub's answer, because he is correct. I was trying a bunch of things to get around windows here.
接受zub的回答，因为他是对的。我尝试了很多方法来绕过这里的窗户。
回答by Slaters
For those who use postman like me just try to send the request as POST>>RAW and create your Json to do the post, in my test i have created a simple json like this and works:
对于像我这样使用邮递员的人，只需尝试将请求作为 POST>>RAW 发送并创建您的 Json 来完成发布，在我的测试中，我创建了一个像这样的简单 json 并且可以正常工作：
{ "name": "test" }
{“名称”：“测试”}
Using form-data or x-www-form-urlencoded it doesn't work.
使用 form-data 或 x-www-form-urlencoded 它不起作用。
回答by Yuanpeng.Zheng
Under Windows cmd:
在 Windows cmd 下：
curl -H "Content-Type: application/json" -d "{"""test""": """this"""}" localhost:3000/rest/user/authenticate
or use cygwin:
或使用 cygwin：
curl -H "Content-Type: application/json" -d '{"test": "this"}' localhost:3000/rest/user/authenticate
My 2 cents
我的 2 美分
