node.js 帖子上的 req.body 为空
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req.body empty on posts
提问by Joseph Dailey
All of a sudden this has been happening to all my projects.
突然之间，我所有的项目都发生了这种情况。
Whenever I make a post in nodejs using express and body-parser req.bodyis an empty object.
每当我使用 express 在 nodejs 中发帖时，body-parserreq.body都是一个空对象。
var express = require('express')
var bodyParser = require('body-parser')
var app = express()
// parse application/x-www-form-urlencoded
app.use(bodyParser.urlencoded())
// parse application/json
app.use(bodyParser.json())
app.listen(2000);
app.post("/", function (req, res) {
console.log(req.body) // populated!
res.send(200, req.body);
});
Via ajax and postman it's always empty.
通过 ajax 和 postman，它总是空的。
However via curl
但是通过 curl
$ curl -H "Content-Type: application/json" -d '{"username":"xyz","password":"xyz"}' http://localhost:2000/
it works as intended.
它按预期工作。
I tried manually setting Content-type : application/jsonin the former but I then always get 400 bad request
我尝试Content-type : application/json在前者中手动设置，但我总是得到400 bad request
This has been driving me crazy.
这让我发疯了。
I thought it was that something updated in body-parser but I downgraded and it didn't help.
我以为是 body-parser 更新了一些东西，但我降级了，它没有帮助。
Any help appreciated, thanks.
任何帮助表示赞赏，谢谢。
回答by Mick Cullen
In Postman of the 3 options available for content type select "X-www-form-urlencoded" and it should work.
在可用于内容类型的 3 个选项的 Postman 中，选择“X-www-form-urlencoded”，它应该可以工作。
Also to get rid of error message replace:
还要摆脱错误消息替换：
app.use(bodyParser.urlencoded())
With:
和：
app.use(bodyParser.urlencoded({
extended: true
}));
See https://github.com/expressjs/body-parser
见https://github.com/expressjs/body-parser
The 'body-parser' middleware only handles JSON and urlencoded data, not multipart
'body-parser' 中间件只处理 JSON 和 urlencoded 数据，而不是 multipart
回答by sirthud
With Postman, to test HTTP post actions with a raw JSON data payload, select the rawoption and set the following header parameters:
使用 Postman，要使用原始 JSON 数据负载测试 HTTP 发布操作，请选择该raw选项并设置以下标头参数：
Content-Type: application/json
Also, be sure to wrap any strings used as keys/values in your JSON payload in double quotes.
此外，请务必将用作 JSON 有效负载中的键/值的任何字符串用双引号括起来。
The body-parserpackage will parse multi-line raw JSON payloads just fine.
该body-parser包将很好地解析多行原始 JSON 有效负载。
{
"foo": "bar"
}
Tested in Chrome v37 and v41 with the Postman v0.8.4.13 extension (body-parserv1.12.2 and expressv4.12.3) with the setup below:
使用 Postman v0.8.4.13 扩展（body-parserv1.12.2 和expressv4.12.3）在 Chrome v37 和 v41 中测试，设置如下：
var express = require('express');
var app = express();
var bodyParser = require('body-parser');
// configure the app to use bodyParser()
app.use(bodyParser.urlencoded({
extended: true
}));
app.use(bodyParser.json());
// ... Your routes and methods here
回答by Jason Kim
I made a really dumb mistake and forgot to define nameattributes for inputs in my html file.
我犯了一个非常愚蠢的错误，忘记name在我的 html 文件中定义输入的属性。
So instead of
所以代替
<input type="password" class="form-control" id="password">
I have this.
我有这个。
<input type="password" class="form-control" id="password" name="password">
Now request.bodyis populated like this: { password: 'hhiiii' }
现在request.body填充如下：{ password: 'hhiiii' }
回答by Xan-Kun Clark-Davis
I discovered, that it works when sending with content type
我发现，它在使用内容类型发送时有效
"application/json"
“应用程序/json”
in combination with server-side
结合服务器端
app.use(bodyParser.json());
app.use(bodyParser.json());
Now I can send via
现在我可以通过
var data = {name:"John"}
var xmlHttp = new XMLHttpRequest();
xmlHttp.open("POST", theUrl, false); // false for synchronous request
xmlHttp.setRequestHeader("Content-type", "application/json");
xmlHttp.send(data);
and the result is available in request.body.nameon the server.
结果request.body.name在服务器上可用。
回答by stone
I ran into this problem today, and what fixed it was to remove the content-type headerin Postman! Very strange. Adding it here in case it helps someone.
我今天遇到了这个问题，解决方法是删除Postman中的 content-type 标头！很奇怪。在这里添加它以防它对某人有帮助。
I was following the BeerLocker tutorial here: http://scottksmith.com/blog/2014/05/29/beer-locker-building-a-restful-api-with-node-passport/
我在这里关注 BeerLocker 教程：http://scottksmith.com/blog/2014/05/29/beer-locker-building-a-restful-api-with-node-passport/
回答by Tuan
You have to check whether the body-parser middleware is set properly to the type of request(json, urlencoded).
您必须检查 body-parser 中间件是否正确设置为请求类型（json，urlencoded）。
If you have set,
如果你已经设置，
app.use(bodyParser.json());
then in postman you have to send the data as raw.
然后在邮递员中，您必须将数据作为原始数据发送。
https://i.stack.imgur.com/k9IdQ.pngpostman screenshot
https://i.stack.imgur.com/k9IdQ.png邮递员截图
If you have set,
如果你已经设置，
app.use(bodyParser.urlencoded({
extended: true
}));
then 'x-www-form-urlencoded' option should be selected.
然后应该选择“x-www-form-urlencoded”选项。
回答by fiat
My problem was I was creating the route first
我的问题是我首先创建了路线
// ...
router.get('/post/data', myController.postHandler);
// ...
and registering the middleware afterthe route
并在路由之后注册中间件
app.use(bodyParser.json());
//etc
due to app structure & copy and pasting the project together from examples.
由于应用程序结构和从示例中复制和粘贴项目。
Once I fixed the order to register middleware before the route, it all worked.
一旦我在路由之前修复了注册中间件的顺序，一切都奏效了。
回答by Shaggie
Even when i was learning node.js for the first time where i started learning it over web-app, i was having all these things done in well manner in my form, still i was not able to receive values in post request. After long debugging, i came to know that in the form i have provided enctype="multipart/form-data"due to which i was not able to get values. I simply removed it and it worked for me.
即使当我第一次学习 node.js 时，我开始通过 web 应用程序学习它，我已经在我的表单中以良好的方式完成了所有这些事情，但我仍然无法在 post 请求中接收值。经过长时间的调试，我开始知道在我提供的表单中我enctype="multipart/form-data"无法获得值。我只是删除了它，它对我有用。
回答by Mohammad Haque
It seems if you do not use any encType (default is application/x-www-form-urlencoded) then you do get text input fields but you wouldn't get file.
似乎如果您不使用任何 encType （默认为application/x-www-form-urlencoded），那么您确实会获得文本输入字段，但不会获得文件。
If you have a form where you want to post text input and file then use multipart/form-dataencoding type and in addition to that use multermiddleware. Multer will parse the request object and prepare req.filefor you and all other inputs fields will be available through req.body.
如果您有一个表单，要在其中发布文本输入和文件，则使用multipart/form-data编码类型，此外还使用multer中间件。Multer 将解析请求对象并req.file为您准备，所有其他输入字段将通过req.body.
回答by vpage
Make sure ["key" : "type", "value" : "json"] & ["key":"Content-Type", "value":"application/x-www-form-urlencoded"] is in your postman request headers
确保 ["key" : "type", "value" : "json"] & ["key":"Content-Type", "value":"application/x-www-form-urlencoded"] 在您的邮递员请求标头
