contentful.js

let contentful = require('contentful')
const space = 'kl86qt22vgc9'
const accessToken = 'faa977ce007881a00f698b518482190e13c037b0b1011766101aad9c6bb5f107'
let client = contentful.createClient({ space, accessToken })

async function fetchEntry (entry) {
  try {
    const reply = await client.getEntry(entry)
    return reply.fields
  } catch (error) {
    return {
      'Status code': error.response.status,
      'Error message': error.message
    }
  }
}

module.exports.fetchEntry = fetchEntry

index.js

let express = require('express')
let { fetchEntry } = require('./contentful')

const PORT = 3000
const app = express()

app.get('/', (req, res) => {
  res.send('Hello, World!')
})

app.get('/about', (req, res) => {
  fetchEntry('3ESKTo0plSs4UUEee8gCGy')
  .then(contentResponseBody => res.send(contentResponseBody.about.toString()))
})

app.listen(PORT, () => console.log(`Example app listening on port ${PORT}`))