[英]Express: can I use multiple middleware in a single app.use?
I have a lot of apps full of boilerplate code that looks like this: 我有很多充满样板代码的应用程序,如下所示:
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(require('express-session')({
secret: 'keyboard cat',
resave: false,
saveUninitialized: false
}));
app.use(passport.initialize());
app.use(passport.session());
How can I use multiple middleware at once? 如何一次使用多个中间件? So I could turn the above into:
所以我可以将以上内容变成:
// Some file, exporting something that can be used by app.use, that runs multiple middlewares
const bodyParsers = require('body-parsers.js')
const sessions= require('sessions.js')
// Load all bodyparsers
app.use(bodyParsers)
// Load cookies and sessions
app.use(sessions)
You can specify multiple middlewares, see the app.use docs : 您可以指定多个中间件,请参阅app.use docs :
An array of combinations of any of the above.
以上任何组合的数组。
You can create a file of all middlewares like - 您可以创建所有中间件的文件,例如-
middlewares.js middlewares.js
module.exports = [
function(req, res, next){...},
function(req, res, next){...},
function(req, res, next){...},
.
.
.
function(req, res, next){...},
]
and as then simply add it like: 然后像这样简单地添加它:
/*
you can pass any of the below inside app.use()
A middleware function.
A series of middleware functions (separated by commas).
An array of middleware functions.
A combination of all of the above.
*/
app.use(require('./middlewares.js'));
Note - Do this only for those middlewares which will be common for all requests 注意-仅对所有请求通用的中间件执行此操作
I like to use a Router
to encapsulate application routes. 我喜欢使用
Router
来封装应用程序路由。 I prefer them over a list of routes because a Router
is like a mini express application. 我更喜欢它们而不是路由列表,因为
Router
就像一个小型快递应用程序。
You can create a body-parsers
router like so: 您可以这样创建一个
body-parsers
路由器:
const {Router} = require('express');
const router = Router();
router.use(bodyParser.json());
router.use(bodyParser.urlencoded({ extended: false }));
router.use(cookieParser());
router.use(require('express-session')({
secret: 'keyboard cat',
resave: false,
saveUninitialized: false
}));
router.use(passport.initialize());
router.use(passport.session());
module.exports = router;
Then attach it to your main application like any other route: 然后像其他路线一样将其附加到您的主应用程序:
const express = require('express');
const app = express();
app.use(require('./body-parsers'));
Try it like this, in main app.js run just init code: 像这样尝试,在主app.js中仅运行初始化代码:
const bodyParserInit = require('./bodyParserInit');
....
bodyParserInit(app);
And then in bodyParserInit you can do app.use 然后在bodyParserInit中可以执行app.use
module.exports = function (app) {
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
}
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