PPTX to JSON

import { PPTX } from 'modern-openxml'
import presetShapeDefinitions from 'modern-openxml/presetShapeDefinitions'

fetch('example.pptx')
  .then(rep => rep.arrayBuffer())
  .then((buffer) => {
    const pptx = new PPTX(buffer, { presetShapeDefinitions })
    console.log(pptx.toJSON())
  })

PPTX to SVG

import { PPTX, PPTXToSVGRenderer } from 'modern-openxml'
import presetShapeDefinitions from 'modern-openxml/presetShapeDefinitions'

fetch('example.pptx')
  .then(rep => rep.arrayBuffer())
  .then((buffer) => {
    const pptx = new PPTX(buffer, { presetShapeDefinitions })
    const svgRenderer = new PPTXToSVGRenderer(pptx)
    document.body.appendChild(svgRenderer.toSVG())
    console.log(svgRenderer.toSVGString())
  })