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Express 4におけるmiddlewareの扱い

きっかけ

Express.jsをドットインストールで勉強してたが、動画のExpressは3系だった。手元のExpressのバージョンは4なのでいくつかの相違点があり、特にmiddlewareの使い方が大きく変わっている事がわかった。

結論

ほとんどのmiddleware(loggerなど)は個別にインストールする必要がある。

//ロガーの例
// Express 3
app.use(express.logger('dev'))

// Express 4
// まず`npm install morgan`が必要
logger = require('morgan')
app.use(logger('dev'))

参考

Express入門
https://dotinstall.com/lessons/basic_expressjs

Connect
https://github.com/senchalabs/connect#middleware

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