使用Node.js和Express框架無法讀取帖子參數

Question

我有一個使用express框架的node.js服務器。

var express = require('express'); 
var http = require('http'); 
var api_helper = require('./helpers/api_helper'); 
var app = express(); 

app.use(app.router); 
app.use(express.bodyParser()); 
app.set('port', process.env.PORT || 8081); 

app.post('/api/nodev1/users/login', function(req, res){ 
    var email = req.param('email', null); 
    var password = req.param('password', null); 
    console.log(email);console.log(password); 
}); 

http.createServer(app).listen(app.get('port'), function(){ 
    console.log('Express server listening on port ' + app.get('port')); 
}); 

當我嘗試發送請求到/ api/nodev1/users/login時，我無法讀取參數。我正在嘗試使用curl如下：

curl -d "email=user@example2.com" -d "password=mypassword" http://localhost:8081/api/nodev1/users/login 

電子郵件和密碼未定義。

Answer 1

您必須移動app.use(app.router)低於app.use(express.bodyParser())。 app.router只是一個處理你的路線的舞臺。如果它在bodyParser之前發生，則不會分析正文。

您的代碼看起來是這樣的（如果我沒能解釋可以理解）：

var app = express(); 

app.use(express.bodyParser()); 
app.set('port', process.env.PORT || 8081); 

app.use(app.router); 

// I added following line so you can better see what happens 
app.use(express.logger('dev')); 

app.post('/api/nodev1/users/login', function(req, res){ ... } 

Offtopic句話：express.bodyParser()當你有文件上傳，才應使用。然後你必須照顧刪除臨時文件。如果你沒有文件上傳，你最好只用

app.use(express.json()); 
app.use(express.urlencoded()); 

我只是想補充一點，如果你不知道。我跑的問題，因爲我不知道......

編輯爲Express 4的

感謝@喬納森翁有因爲快遞4無app.use(app.router)：

All routing methods will be added in the order in which they appear. You should not do app.use(app.router) . This eliminates the most common issue with Express.

In other words, mixing app.use() and app[VERB]() will work exactly in the order in which they are called.

Read more: New features in 4.x。

Answer 2

編輯 - 不，請參閱有關中間件訂單的其他答案！

---

變化req.param到req.body.x：

app.post('/api/nodev1/users/login', function(req, res){ 
    var email = req.param('email', null); 
    var password = req.param('password', null); 
    console.log(email);console.log(password); 
}); 

到

app.post('/api/nodev1/users/login', function(req, res){ 
    var email = req.body.email); 
    var password = req.body.password); 
    console.log(email); console.log(password); 
});