fill-up-a-pouchdb-database.js

var numberOfDocs = 1000
var userName = 'RJ'
var templateDoc = {
  yourDocHere: true
}

var fillUp = async (numberOfDocs, templateDoc, dbName) => {
  let initialEstimate = await navigator.storage.estimate()
  let db = new PouchDB(dbName)
  delete templateDoc._rev
  let i = 0
  while (numberOfDocs > i) {
    let doc = Object.assign({}, templateDoc, { _id: `${i}` })
    await db.put(doc)
    i++
  }
  let concludingEstimate = await navigator.storage.estimate()
  console.log(`
    Initial Estimate: ${JSON.stringify(initialEstimate)}
    Concluding estimate: ${JSON.stringify(concludingEstimate)}
    Usage Difference: ${concludingEstimate.usage - initialEstimate.usage} bytes
    Average Doc Size: ${(concludingEstimate.usage - initialEstimate.usage) / numberOfDocs} bytes
  `)
}

fillUp(numberOfDocs, templateDoc, userName)