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Why is jsPDF HTML to PDF export slow?

I'm using jsPDF to generate PDF files from HTML tables, but it takes more than one second to convert a simple table (5x10 cells) containing only text which is way too long for such a "simple" task. Below are the lines of code responsible for the conversion. What am I missing?
const doc = new jsPDF();
const htmlContent = liElements[i].firstChild as HTMLElement;
doc.html(htmlContent).then(() => {
const buffer = doc.output("arraybuffer");
resolve(buffer);
});
Don't have enough reputition to embedd an image, but here is an image of the profiler while exporting a 6 page pdf, where 4 pages use HTML.

Browser Copy/Paste the components

We are using new clipboard API to implement the browser/operating system wide copy paste.
We have a set of components (Assume it like a flow charts which have connected div) and that is build from a simple json.
Our goal is to implement Copy and paste. We have a underlying JsON in hand, i tried to save the Json file in clipboard.
Now the real problem starts:
1: Copy and Paste is operating system wide, so how can i know that, currently copied element is json and that is what we needed to build the flow. Eg: a user can copy whatever they want, but i only want the data which my system can parse.
2: How generally these type of applications works, for example, on Slack, i copied a formatted markdown message into my clipboard and i pasted the same into a text editor, but i don't see any markdown command on the selected text, but somehow i pasted the same thing in slack, i got the same message which i copied earlier.
Is anyone have done Copy/Paste of components,
Any help highly appreciated.

Here's a basic example for how to do clipboard manipulation. Read up on paste and copy events for more detailed info. You could also try to set a different content-type for the clipboard data. This is probably how Slack does it: Set one clipboard entry in plain text (without markdown formatting) and one in Markdown.
const input = document.getElementById("testInput");
input.addEventListener("copy", (e) => {
console.log("copied!");
e.clipboardData.setData('text/plain', JSON.stringify({
test: "value"
}));
e.preventDefault();
});
input.addEventListener("paste", (e) => {
console.log("pasted!");
//console.log(e);
if (e.clipboardData.types[0] == "text/plain") {
const txt = e.clipboardData.getData('text')
try {
const json = JSON.parse(txt);
// TODO: validate that object has correct keys
console.log(json);
e.preventDefault();
// I added prevent default, since you probably want to have your own logic for rendering the clipboard content
} catch (e) {
console.error("text is not JSON parseable: " + txt);
}
}
});
<input id="testInput"></input>

Is it possible to use custom Google web fonts with jsPDF

I'm using jsPDF (https://parall.ax/products/jspdf, https://github.com/MrRio/jsPDF) to produce dynamic PDFs in a web application.
It works well, but I'd like to figure out whether it's possible to use Google web fonts in the resulting PDF.
I've found a variety of links that are related to this question (including other questions on SO), but most are out of date, and nothing looks definitive, so I'm hoping someone clarify whether/how this would work.
Here's what I've tried so far, with no success:
First, load the font, and cache it as a base64-encoded string:
var arimoBase64;
var request = new XMLHttpRequest()
request.open('GET', './fonts/Arimo-Regular.ttf');
request.responseType = 'blob';
request.onload = function() {
var reader = new FileReader();
reader.onloadend = function() {
arimoBase64 = this.result.split(',')[1];
}
reader.readAsDataURL(this.response);
};
request.send()
Next, create the pdf doc:
doc = new jsPDF({
orientation: "landscape",
unit: "pt",
format: "letter"
});
doc.addFileToVFS("Arimo-Regular.ttf", arimoBase64);
doc.addFont("Arimo-Regular.ttf", "Arimo Regular", "normal");
doc.setFont("Arimo Regular", "normal");
doc.text("Hello, World!", 100, 100);
doc.save("customFontTest");
When the PDF is saved - if I view it in my browser - I can see the custom font. However - if I view it using Adobe Reader or the Mac Preview app - the fonts are not visible.
I assume that's because the font is rendered in the browser using the browser's font cache, but the font is not actually embedded in the PDF, which is why it's not visible using Adobe Reader.
So - is there a way to accomplish what I'm trying to do?

OK - I finally figured it out, and have gotten it to work. In case this is useful for anyone else - here is the solution I'm using...
First - you need two libraries:
jsPDF: https://github.com/MrRio/jsPDF
jsPDF-CustomFonts-support: https://github.com/sphilee/jsPDF-CustomFonts-support
Next - the second library requires that you provide it with at least one custom font in a file named default_vfs.js.
That file should look like this:
(function (jsPDFAPI) {
"use strict";
jsPDFAPI.addFileToVFS("[Your font's name]","[Base64-encoded string of your font]");
})(jsPDF.API);
I'm using two custom fonts - Arimo-Regular.ttf and Arimo-Bold.ttf - both from Google Fonts. So, my default_vfs.js file looks like this:
(function (jsPDFAPI) {
"use strict";
jsPDFAPI.addFileToVFS("Arimo-Regular.ttf","[Base64-encoded string of your font]");
jsPDFAPI.addFileToVFS("Arimo-Bold.ttf","[Base64-encoded string of your font]");
})(jsPDF.API);
There's a bunch of ways to get the Base64-encoded string for your font, but I used this: https://www.giftofspeed.com/base64-encoder/.
It lets you upload a font .ttf file, and it'll give you the Base64 string that you can paste into default_vfs.js.
You can see what the actual file looks like, with my fonts, here: https://cdn.rawgit.com/stuehler/jsPDF-CustomFonts-support/master/dist/default_vfs.js
So, once your fonts are stored in that file, your HTML should look like this:
<script src="js/jspdf.min.js"></script>
<script src="js/jspdf.customfonts.min.js"></script>
<script src="js/default_vfs.js"></script>
Finally, your JavaScript code looks something like this:
const doc = new jsPDF({
unit: 'pt'
});
doc.addFont("Arimo-Regular.ttf", "Arimo", "normal");
doc.addFont("Arimo-Bold.ttf", "Arimo", "bold");
doc.setFont("Arimo");
doc.setFontType("normal");
doc.setFontSize(28);
doc.text("Hello, World!", 100, 100);
doc.setFontType("bold");
doc.text("Hello, BOLD World!", 100, 150);
doc.save("customFonts.pdf");
This is probably obvious to most, but in that addFont() method, the three parameters are:
The font's name you used in the addFileToVFS() function in the default_vfs.js file
The font's name you use in the setFont() function in your JavaScript
The font's style you use in the setFontType() function in your JavaScript
You can see this working here: https://codepen.io/stuehler/pen/pZMdKo
Hope this works as well for you as it did for me.

I recently ran into this same issue, but it looks like the jsPDF-CustomFonts-support repo was rolled into MrRio's jsPDF repository, so you no longer need it to get this working.
I happen to be using it in a React App and did the following:
npm install jspdf
Create a new file fonts/index.js (Note: You can download the Google Font as a .ttf and turn it into the Base64 encoded string using the tool in mattstuehler's answer)
export const PlexFont = "[BASE64 Encoded String here]";
Import that file where you need it:
import jsPDF from 'jspdf';
import { PlexFont } from '../fonts';
// Other Reacty things...
exportPDF = () => {
const doc = new jsPDF();
doc.addFileToVFS('IBMPlexSans-Bold.ttf', PlexBold);
doc.addFont('IBMPlexSans-Bold.ttf', 'PlexBold', 'normal')
doc.setFont('PlexBold');
doc.text("Some Text with Google Fonts", 0, 0);
// Save PDF...
}
// ...

Just wanted to add an updated answer - for version 1.5.3:
Convert the font file to base64 = https://www.giftofspeed.com/base64-encoder/
const yanone = "AAWW...DSES"; // base64 string
doc.addFileToVFS('YanoneKaffeesatz-Medium.ttf', yanone);
doc.addFont('YanoneKaffeesatz-Medium.ttf', 'YanoneKaffeesatz', 'normal');
doc.setFont('YanoneKaffeesatz');

JavaScript pdf generation library with Unicode support

I want to generate a pdf file using JavaScript at client side . Firstly I tried using jsPdf API . But it does not work with Unicode character like Chinese.
Is there any option to enhance jspdf to support Unicode or any other library which supports Unicode .
Pdfmake API says it supports Unicode but when I tried it also does not work out, I checked in there demo example placing Unicode character .
I tried using pdfkit in Node.js but pdf is not getting created properly
var PDFDocument = require("pdfkit");
var fs = require('fs');
var doc = new PDFDocument;
doc.pipe(fs.createWriteStream('output.pdf'));
doc.fontSize(15);
doc.text('Generate PDF! 漢字漢字漢字漢字');
doc.end();
In pdf it created as Generate PDF! o"[Wo"[Wo"[Wo"[W
Also , Can I add multiple font in pdfMake
var fontDescriptors = {
Roboto: {
normal: 'examples/fonts/Roboto-Regular.ttf',
bold: 'examples/fonts/Roboto-Medium.ttf',
italics: 'examples/fonts/Roboto-Italic.ttf',
bolditalics: 'examples/fonts/Roboto-Italic.ttf'
}
};
var printer = new pdfMakePrinter(fontDescriptors);

I'll describe a solution using Node.js and PDFKit since you mentioned it but it also applies to pdfmake which internally uses PDFKit.
Most of the time, the default font used in these libraries do not accept Chinese characters. You have to add and use fonts that are compatible for the languages you need to support. If we take pdfmake for example, they use Roboto as their default font and it indeed does not accept Chinese characters.
Using your code example, we can add support for Chinese using the Microsoft YaHei font (msyh.ttf) for instance with only 1 additional line of code:
var PDFDocument = require("pdfkit");
var fs = require('fs');
var doc = new PDFDocument;
doc.pipe(fs.createWriteStream('output.pdf'));
doc.font('fonts/msyh.ttf');
doc.fontSize(15);
doc.text('Generate PDF! 漢字漢字漢字漢字');
doc.end();
The output would look like this:

Generating PDF files with JavaScript

I’m trying to convert XML data into PDF files from a web page and I was hoping I could do this entirely within JavaScript. I need to be able to draw text, images and simple shapes. I would love to be able to do this entirely in the browser.

I've just written a library called jsPDF which generates PDFs using Javascript alone. It's still very young, and I'll be adding features and bug fixes soon. Also got a few ideas for workarounds in browsers that do not support Data URIs. It's licensed under a liberal MIT license.
I came across this question before I started writing it and thought I'd come back and let you know :)
Generate PDFs in Javascript
Example create a "Hello World" PDF file.
// Default export is a4 paper, portrait, using milimeters for units
var doc = new jsPDF()
doc.text('Hello world!', 10, 10)
doc.save('a4.pdf')
<script src="https://cdnjs.cloudflare.com/ajax/libs/jspdf/1.3.5/jspdf.debug.js"></script>

Another javascript library worth mentioning is pdfmake.
pdfmake playground
pdfmake on github
The browser support does not appear to be as strong as jsPDF, nor does there seem to be an option for shapes, but the options for formatting text are more advanced then the options currently available in jsPDF.

I maintain PDFKit, which also powers pdfmake (already mentioned here). It works in both Node and the browser, and supports a bunch of stuff that other libraries do not:
Embedding subsetted fonts, with support for unicode.
Lots of advanced text layout stuff (columns, page breaking, full unicode line breaking, basic rich text, etc.).
Working on even more font stuff for advanced typography (OpenType/AAT ligatures, contextual substitution, etc.). Coming soon: see the fontkit branch if you're interested.
More graphics stuff: gradients, etc.
Built with modern tools like browserify and streams. Usable both in the browser and node.
Check out http://pdfkit.org/ for a full tutorial to see for yourself what PDFKit can do. And for an example of what kinds of documents can be produced, check out the docs as a PDF generated from some Markdown files using PDFKit itself: http://pdfkit.org/docs/guide.pdf.
You can also try it out interactively in the browser here: http://pdfkit.org/demo/browser.html.

Another interesting project is texlive.js.
It allows you to compile (La)TeX to PDF in the browser.

For react fans there is another great resource for PDF generation: React-PDF
It is great for creating PDF files in React and even let the user download them from the client side itself with no server required!
this is a small example snippet of React-PDF to create a 2 section PDF file
import React from 'react';
import { Page, Text, View, Document, StyleSheet } from '#react-pdf/renderer';
// Create styles
const styles = StyleSheet.create({
page: {
flexDirection: 'row',
backgroundColor: '#E4E4E4'
},
section: {
margin: 10,
padding: 10,
flexGrow: 1
}
});
// Create Document Component
const MyDocument = () => (
<Document>
<Page size="A4" style={styles.page}>
<View style={styles.section}>
<Text>Section #1</Text>
</View>
<View style={styles.section}>
<Text>Section #2</Text>
</View>
</Page>
</Document>
);
This will produce a PDF document with a single page. Inside, two different blocks, each of them rendering a different text. These are not the only valid primitives you can use. you can refer to the Components or Examples sections for more information.

It is worth mentioning PDF-LIB which is an awesome library:
Supports pure JavaScript.
Can edit existing PDF templates even with pure JavaScript. (Most impotently. Many JavaScript libraries can't do it)
It is generating a PDF with select-able/copy-able/highlight-able text not an image file inside an PDF like many other libraries generate.
More easy to use. (I love it)
If you are interested in using it with pure JavaScript this may
help.
If you are interested to do the same with the most popular JavaScript
library as of now JSPDF this may help. (Simply JSPdf can't do most time saving thing we want, editing an existing template.)
See how pretty the code is
<script type="text/javascript">
async function downloadPdf() {
const url = './print-templates/pquot-template.pdf';
const existingPdfBytes = await fetch(url).then(res => res.arrayBuffer());
// Getting the document
const pdfDoc = await PDFLib.PDFDocument.load(existingPdfBytes);
// Getting the first page
const pages = pdfDoc.getPages();
const firstPage = pages[0];
// Customer name
firstPage.drawText('Customer name is here with more text (GAR004) quick brown customerm jumps over lazy dog.', {
x: 10.5*9,
y: 76.6*9,
size: 10,
maxWidth: 28*9, // Wrap text with one line. WOW :O
lineHeight: 1.5*9
});
// Currency short code
firstPage.drawText('LKR', {
x: 10.5*9,
y: 73.5*9,
size: 10
});
var itemName = 'Here is the item name with some really really long text and quick brown fox jumps over lazy dog. long text and quick brown fox jumps over lazy dog:)';
// Item name
firstPage.drawText(itemName, {
x: 5*9,
y: 67*9,
size: 10,
maxWidth: 31*9,
lineHeight: 2*9
});
const pdfDataUri = await pdfDoc.saveAsBase64({ dataUri: true });
document.getElementById('pdf').src = pdfDataUri;
}
</script>

UPDATE: Free service no longer available. But there is a reasonably priced service you can use if you need something in a crunch and it's should be reliable.
https://pdfmyurl.com/plans
You can use this free service by adding a link which creates pdf from any url (e.g. http://www.phys.org):
http://freehtmltopdf.com/?convert=http%3A%2F%2Fwww.phys.org&size=US_Letter&orientation=portrait&framesize=800&language=en

Even if you could generate the PDF in-memory in JavaScript, you would still have the issue of how to transfer that data to the user. It's hard for JavaScript to just push a file at the user.
To get the file to the user, you would want to do a server submit in order to get the browser to bring up the save dialog.
With that said, it really isn't too hard to generate PDFs. Just read the spec.