How to Access Environment Variables in Sanity.json from Next.js

// client.js
import sanityClient from '@sanity/client'

export default sanityClient({
  projectId: 'your-project-id', // you can find this in sanity.json
  dataset: 'production', // or the name you chose in step 1
  useCdn: true // `false` if you want to ensure fresh data
})

import sanityClient from '@sanity/client'
const client = sanityClient({
        projectId: process.env.SANITY_PROJECT_ID,
        dataset: process.env.SANITY_DATASET,
        token: '', // or leave blank for unauthenticated usage
        useCdn: false, // `true` or `false` if you want to ensure fresh data
    })

SANITY_PROJECT_ID=here
SANITY_DATASET=here