Next.js Environment Variables All In One

Next.js Environment Variables All In One

.env

.env.local

DB_HOST=localhost
DB_USER=myuser
DB_PASS=mypassword

// getStaticProps:
// pages/index.js
export async function getStaticProps() {
  const db = await myDB.connect({
    host: process.env.DB_HOST,
    username: process.env.DB_USER,
    password: process.env.DB_PASS,
  })
  // ...
}

NEXT_PUBLIC_

NEXT_PUBLIC_ANALYTICS_ID=abcdefghijk

// pages/index.js
import setupAnalyticsService from '../lib/my-analytics-service'

// 'NEXT_PUBLIC_ANALYTICS_ID' can be used here as it's prefixed by 'NEXT_PUBLIC_'.
// It will be transformed at build time to `setupAnalyticsService('abcdefghijk')`.
setupAnalyticsService(process.env.NEXT_PUBLIC_ANALYTICS_ID)

function HomePage() {
  return <h1>Hello World</h1>
}

export default HomePage

https://nextjs.org/docs/basic-features/environment-variables

https://nextjs.org/docs/api-reference/next.config.js/environment-variables

demo

//  process.env

refs

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