Convert Pocket export CSV to chunked Omnivore backup JSON files

index.cjs

/**
 * Convert CSV from Pocket export file to chunked JSON files in
 * Omnivore format.
 * For import into Wallabag with minimal data loss.
 */

const { readFileSync, writeFileSync } = require('fs')
const { parse } = require('csv/sync')
const { format } = require('fecha')

const INPUT_FILENAME = './part_000000.csv'
const OUTPUT_FILE_PREFIX = './pocket2omnivore'
const CHUNK_LEN = 100

const data = parse(readFileSync(INPUT_FILENAME)).slice(1)

const formatted = data.map(row => ({
  title: row[0],
  url: row[1],
  savedAt: format(new Date(parseInt(row[2], 10) * 1000), 'YYYY-MM-DDTHH:mm:ss.SSS000') + 'Z',
  labels: row[3].split('|'),
  state: row[4] === 'archive' ? 'Archived' : 'Unread',
  author: null,
  publishedAt: null,
}))

for (let i = 0, l = Math.ceil(formatted.length / CHUNK_LEN); i < l; ++i) {
  writeFileSync(
    `${OUTPUT_FILE_PREFIX}-${i}.json`,
    JSON.stringify(formatted.slice(i * CHUNK_LEN, i * CHUNK_LEN + CHUNK_LEN), null, 2),
  )
}