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[Next.js] Herokuでdeployするのに必要な設定

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Next.jsのアプリをそのままHerokuにdeployするとdeployは成功しますが、表示しようとするとエラーになります。

原因はHerokuだとportを$PORTで指定してやる必要があるためです。

よってPackage.jsonのscripts.startのところを以下のように変更します。

  "scripts": {
    ...
    "start": "next start -p $PORT",
  },
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