无法使用Node.js和Express框架读取post参数

Question

I have a node.js server with express Framework.

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'));
});

When I try to post a request to /api/nodev1/users/login I cannot read the parameters. I am trying with curl as follows:

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

The email and password are undefined.

Answer 1

You have to move app.use(app.router) below app.use(express.bodyParser()) . app.router is just a hook in which stage to handle your routes. And if it comes before bodyParser the body is not parsed.

Your code could look like this (in case I didn't manage to explain understandable):

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 remark : express.bodyParser() should only be used when you have file-uploads. And then you have to take care of deleting temp-files. If you don't have file-uploads, you are better off with only

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

I just wanted to add this in case you didn't know. I ran in problems because I didn't know...

Edit for Express 4

Thanks to @jonathan-ong there is no app.use(app.router) since Express 4:

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

edit - nope, see other answer about middleware order!

---

change req.param to 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);
});

to

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);
});