How can I get PDF dimensions in pixels in Node.js?

Question

I tried pdf2json:

const PDFParser = require("pdf2json");
let pdfParser = new PDFParser();

pdfParser.loadPDF("./30x40.pdf"); // ex: ./abc.pdf

pdfParser.on("pdfParser_dataReady", pdfData => {
  width = pdfData.formImage.Width; // pdf width
  height = pdfData.formImage.Pages[0].Height; // page height

  console.log(`Height : ${height}`) // logs 70.866
  console.log(`Width : ${width}`) // logs 53.15
});

But it gave the dimensions in a unknown units!

The dimensions in pixels will help me include them in the pdf-poppler module that converts a pdf file to an image and it needs the pdf file height in pixels.

Answer 1

Try calipers. Code example:

const Calipers = require('calipers')('png', 'pdf');
Calipers.measure('./30x40.pdf')
.then(data => {
  const { width, height } = data.pages[0];
});

Alternatively, try a module which converts it without needing width/height: pdf2pic pdf-image node-imagemagick If you're set on using pdf2json, please read this bit of documentation describing the units of the output.

Answer 2

Bit late to the party, but as discussed here: stackoverflow pdf2json unit you can multiply your width and height by 24 Just like:

width = pdfData.formImage.Width * 24; // pdf width
height = pdfData.formImage.Pages[0].Height * 24; // page height

and you get Pixel.