const PDFDocument = require('pdfkit');
const https = require('https');

let pdf = new PDFDocument;
let writeSecondStream = fs.createWriteStream('out.pdf');
pdf.pipe(writeSecondStream);
let body = [];
https.get('https://compote.slate.com/images/c9320bfa-e49d-41af-bccc-f85351038055.jpg', function(res) {
	if (res.statusCode != 200) {
		return console.log('HTTP Response code ' + res.statusCode);
	}
	res.on('data', (chunk) => {
		console.log(chunk);
		body.push(chunk);
	}).on('end', () => {
		let allbody = body.join();
		console.log("allbody = ", allbody);
		pdf.image(allbody, 25, 25);
	})
});
pdf.end();

<Buffer 8a 28 00 a2 8a 28 00 a2 8a 28 00 a2 8a 28 00 a2 8a 28 00 a2 8a 28 00 a2 8a 28 00 a2 8a 28 00 a2 8a 28 00 a2 8a 28 00 a2 8a 28 00 a4 a5 a4 eb 40 05 14 ... >
<Buffer c7 91 f4 35 d1 1c 5c 5b b3 56 29 49 33 a3 a2 a2 b7 b9 8a e6 3d f1 36 40 ea 31 c8 fc 2a 5a ea 4d 35 74 50 51 da 8a 29 80 52 52 d1 40 09 4b 40 f6 a2 80 ... >

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�um� =��� ��́�?�I��v�������.�������H/m[��k�.�cpO@V��{!�Tz���]������:�n�*���4��y2�L�i*�2:U'.�^E������G�`�`P�ґ��}�����S�ڋ˰��Mw� ��T��j���q�

fs.js:162
      throw er;
      ^

Error: Path must be a string without null bytes
    at nullCheck (fs.js:159:14)
    at Object.fs.openSync (fs.js:645:3)
    at Object.fs.readFileSync (fs.js:551:33)
    at Function.PDFImage.open (C:\Users\jayne\nodeauthapi\node_modules\pdfkit\js\image.js:32:21)
    at PDFDocument.openImage (C:\Users\jayne\nodeauthapi\node_modules\pdfkit\js\mixins\images.js:102:26)
    at PDFDocument.image (C:\Users\jayne\nodeauthapi\node_modules\pdfkit\js\mixins\images.js:30:24)
    at IncomingMessage.res.on.on (C:\Users\jayne\nodeauthapi\app.js:499:9)
    at emitNone (events.js:111:20)
    at IncomingMessage.emit (events.js:208:7)
    at endReadableNT (_stream_readable.js:1064:12)
[nodemon] app crashed - waiting for file changes before starting...