无法在快速中间件中获取请求参数 [英] Cannot get request params in express middleware

问题描述

我无法读取我的中间件中的任何req.params。我有一个最小的快速网络服务器，看起来像

I am not able to read any req.params in my middleware. I have a minimal express web server that looks like

'use strict';

var express = require('express');
var app = express();

//middleware
function userMiddleware(req, res, next) {
  console.log('user came in. Hello ' + req.param('name'));
  next();
}

//register middleware
app.use('/user', userMiddleware)

// routes
app.get('/user/:name', function(req, res) {
  res.send('username : ' + req.params.name);
});

app.listen(3000);
console.log("listening on 3000...");

当我尝试点击localhost：3000 / user / williams时，我希望在日志中看到：

When I try to hit localhost:3000/user/williams , I expect to see in the log :

user came in. Hello williams

但我看到

user came in. Hello undefined

我应该包括任何其他中间件，以便req.params填充在中间件中？
我使用 express@3.3.4

Should I include any other middleware so that the req.params is populated in the middleware ? I'm using express@3.3.4

推荐答案

我认为 app.param（）在这种情况下是非常规的，并不真正直观。因为我已经有代表中间件的功能，我可以这样做：

I think app.param() is unconventional in this case and not really intuitive. Since I already had the function representing the middleware, I could do :

//middleware
function userMiddleware(req, res, next) {
  console.log('user came in. Hello ' + req.params.name);
  next();
}

// routes
app.get('/user/:name', userMiddleware, function(req, res) {
  res.send('username : ' + req.params.name);
});

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