Convert a PDF to JSON with pdf.js.

pdf2json.js

const fs = require('fs')
const pdfjs = require('pdfjs-dist')

const readPdf = async filename => {
  const buf = await fs.promises.readFile(filename)
  const doc = await pdfjs.getDocument(buf).promise
  const docBlob = {
    metadata: null,
    pages: []
  }

  docBlob.metadata = await doc.getMetadata()

  for (let i = 1; i <= doc.numPages; i++) {
    const page = await doc.getPage(i)
    const pageBlob = {}
    pageBlob.viewport = page.getViewport({ scale: 1.0 })
    pageBlob.items = []

    const textContent = await page.getTextContent()
    for (const item of textContent.items) {
      // Set some convenience properties
      item.x1 = item.transform[4]
      item.x2 = item.x1 + item.width
      item.y1 = item.transform[5]
      item.y2 = item.y1 + item.height

      pageBlob.items.push(item)
    }

    docBlob.pages.push(pageBlob)
  }

  console.log(require('util').inspect(docBlob, { depth: null }))
  return docBlob
}