next.js/examples/pass-server-data/operations/get-item.js

const fs = require('fs')

// In this case, data read from the fs, but it could also be a cached API result.
const data = fs.readFileSync('./data/item.json', 'utf8')
const parsedData = JSON.parse(data)

function getItem () {
  console.log('Requested Item Data:', data)
  return parsedData
}

module.exports = { getItem }