Example of using pdfkit in Node.js

pdf.js

var fs = require('fs');
var PDFDocument = require('pdfkit');

var pdf = new PDFDocument({
  size: 'LEGAL', // See other page sizes here: https://github.com/devongovett/pdfkit/blob/d95b826475dd325fb29ef007a9c1bf7a527e9808/lib/page.coffee#L69
  info: {
    Title: 'Tile of File Here',
    Author: 'Some Author',
  }
});

// Write stuff into PDF
pdf.text('Hello World');

// Stream contents to a file
pdf.pipe(
  fs.createWriteStream('./path/to/file.pdf')
)
  .on('finish', function () {
    console.log('PDF closed');
  });

// Close PDF and write file.
pdf.end();

Didn't notice all the comments till now. Glad it is helping others!

Regarding using with Express, maybe try streaming the response instead of writing to the file?

https://stackoverflow.com/questions/38788721/how-do-i-stream-response-in-express

The issue of the permissions not working is because the ownerPassword property is missing. I needs to be set for the permissions to work.