index.js

// Get Object by Metafield Object ID
const run = async () => {
  const Cosmic = require('cosmicjs')
  const api = Cosmic()
  const bucket = api.bucket({
    slug: 'cosmic-js'
  })
  const data = await bucket.getObjects({
    type: 'articles',
    limit: 20,
    metadata: {
      author: '5768b253163172890e00002c'
    },
    props: 'slug,title'
  })
}
run();