我有这个作为我的快速服务器的配置

app.use(app.router); 
app.use(express.cookieParser());
app.use(express.session({ secret: "keyboard cat" }));
app.set('view engine', 'ejs');
app.set("view options", { layout: true });
//Handles post requests
app.use(express.bodyParser());
//Handles put requests
app.use(express.methodOverride());

但是当我在我的路由中请求req.body.something时,我得到了一些错误,指出body是未定义的。下面是一个使用req的路由示例。身体:

app.post('/admin', function(req, res){
    console.log(req.body.name);
});

我读到这个问题是由缺乏app.use(express.bodyParser())引起的;但你可以看到,我把它叫做路线之前。

有线索吗?


当前回答

// Require body-parser (to receive post data from clients)

var bodyParser = require('body-parser');

app.use(bodyParser.urlencoded({ extended: false }))

// parse application/json

app.use(bodyParser.json())

其他回答

试试这个

npm i multer --save
const express = require('express');
const multer  = require('multer');
const upload = multer();
const app = express();

app.post('/test', upload.any(), (req, res) => {
  console.log('data', req.body);
  res.setHeader('Content-Type', 'application/json');
  res.send(req.body);
});

You have to check following things for that:-
1. app.use(bodyParser.urlencoded({ extended: false }))

// parse application/json
app.use(bodyParser.json())
Implement body parser in your app.

2. Check headers in postman its should be based on your rest api's, like if your Content-Type: application/json it should be defined in your postman headers.

根据@kevin-xue所说,需要声明内容类型。在我的实例中,这只发生在IE9中,因为XDomainRequest不设置内容类型,所以bodyparser和expressjs忽略了请求的主体。

我通过在将请求传递给主体解析器之前显式地设置content-type来解决这个问题,如下所示:

app.use(function(req, res, next) {
    // IE9 doesn't set headers for cross-domain ajax requests
    if(typeof(req.headers['content-type']) === 'undefined'){
        req.headers['content-type'] = "application/json; charset=UTF-8";
    }
    next();
})
.use(bodyParser.json());

请求头中的Content-Type非常重要,特别是当你从curl或任何其他工具中发布数据时。

确保你使用的是application/x-www-form-urlencoded, application/json之类的,这取决于你的post数据。将此字段保留为空将使Express混淆。

我用:

app.post('/', bodyParser.json(), (req, res) => {//we have req.body JSON
});