如何使用Express从不同中间件中的响应对象获取数据

Question

可能是这个愚蠢的问题.. :)可以帮助我从响应对象中获取数据。基本上我想使用Express中的其他中间件来验证我的响应数据

app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));

app.use('/', function(req, res, next){
    console.log('entry point');
    res.json({name:"somename",age: 29});
    next()
});

var middleware = function (req, res, next) {

console.log('LOGGED');

res.end = function (req, res , next) {
    var data = res.data;
    //do some validation logic here
    next()
}};
app.use(middleware);

var port = process.env.PORT || 10010;
app.listen(port);

Answer 1

在中间件函数中，中间件中既没有调用res.end函数，也没有调用next函数。做这样的事情：

app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));

app.use('/', function(req, res, next){
    console.log('entry point');
    res.json({name:"somename",age: 29});
    next()
});

var middleware = function (req, res, next) {

  console.log('LOGGED');

  res.end = function (req, res , next) {
    var data = res.data;
    //do some validation logic here
    next()
  };
  next();
};
app.use(middleware);

app.use((req, res) => res.end()); // here your end function will be called

var port = process.env.PORT || 10010;
app.listen(port);