pdf-lib | modify PDF documents in any JavaScript environment | Document Editor library
kandi X-RAY | pdf-lib Summary
kandi X-RAY | pdf-lib Summary
Create and modify PDF documents in any JavaScript environment
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Trending Discussions on pdf-lib
QUESTION
i was looking for a solution to digitally sign a pdf with a self-signed certificat and came across a video in youtube explaining the process using pdf-lib and node-signpdf libraries. However, after following the instructions it didnt work as intended and encountered a problem:
- i executed the command ( npm i ) and (npm start ) as shown in the github repo of the project.
repo : https://github.com/RichardBray/pdf_sign
Demo ( 8 mins video ) : https://www.youtube.com/watch?v=OFZK5lc70OI&list=PLXUfmx2SIgyICZP-rA84Sle_ghq30W89N&index=4&t=1s
...ANSWER
Answered 2022-Mar-27 at 19:41it appears that the problem is OS related. In fact , the code works fine under linux OS but have some issues with Windows OS related to import command. For windows OS replacing "import" commands with "require" commands solves the problem.
BEFORE:
QUESTION
Im loading a PDF document I have to modify on the fly with PDF-lib.
...ANSWER
Answered 2021-Dec-14 at 18:20Per the documentation, PDFDocument.load()
accepts a string which is the contents of the pdf file, not the name.
QUESTION
I have one pdf file and one image file which is the signature of the client. I need to place the client signature image on the top right corner of every page of pdf. This whole process is in node js so I have used the pdf-lib npm package to attach image on pdf. The current issue I'm unable to place the image on the top-right corner.
Below is the logic which I used to set an image on the top-right corner of the pdf but this logic is not true for every case in some cases when the width of the image or pdf changes then it's not worked as expected. Sometimes images are getting too much small or sometimes too much large.Just because I set fix height and width. As I don't know how to calculate it dynamically
...ANSWER
Answered 2021-Dec-21 at 09:39I got the solution to get dynamic x and y values to set an image on the top-right corner of the pdf
QUESTION
What color format is pdf-lib using? Writing rgb(156, 132, 678)
or cmyk(157, 145, 124, 135)
throws an error where all number values must be between 0 and 1.
How do I convert standard rgb, ie. 0-255 to whatever format this is?
The docs give me the TypeScript definitions of the function but no explanations.
...ANSWER
Answered 2021-Nov-04 at 15:15Documentation gives an example like this color: rgb(0.95, 0.1, 0.1)
. Dividing by 255 is likely the solution.
QUESTION
I use pdf-lib
(JS library) in my React project. I am doing heavy work with the library with async/await
and would like to update progress bar by updating state. Even though I call setState
in setTimeout
, the state is updated after the heavy work ends. So the progress bar shows only 0% and 100%. Could you kindly figure it out? I can't share my code, but if you want, I will show a little.
ANSWER
Answered 2021-Oct-13 at 03:20Remember that "asynchronous" does not mean it runs "in parallel". It just means that code gets to run "out of order" in a controlled fashion.
Your page thread is just a single thread, so if you have a long-running function, you can mark that function as async
or run it with setTimeout
as much as you like but while your function code runs, nothing else gets to run (although in the case of async
: only until the code hits an await
, which I'm assuming pdf-kit does not use).
If you need to do heavy lifting, use a service worker, which is a special API for exactly this thing, running heavy workloads in a separate thread so that you don't block the main page thread.
QUESTION
I have tried to create a custom email receipt template with SendGrid using commercejs webhooks, by following this tutorial. I have uploaded this github repository to
this test Netlify site. The main code is /functions/email.js
I am pretty sure my .env
variables are correct, still no receipt emails are received and probably send. When checking the Netlify function email log says:
ANSWER
Answered 2021-Oct-03 at 23:57Twilio SendGrid developer evangelist here.
You have installed node-fetch to the project, but the tutorial did not include requiring the library into the function to use it. So you need to require node-fetch
.
The tutorial also fails to require the SendGrid library and set the API key. You should set your SendGrid API key in the environment in Netlify, called something like SENDGRID_API_KEY
. Then add the following to the top of your function:
QUESTION
this is my first time testing out Next.js API, I am also quite new to the whole Next.js/React world so bear with me.
The goal for this API route is to trigger an automatic download of a PDF with a custom watermark generated from API URL query parameters like this: /api/PDFWatermark?id=123&firstname=John&lastname=Doe
In order to create the watermark I am using pdf-lib and I am using a modified version of this code to watermark my PDF. To generate a modified and downloadable version of the original PDF pdfDoc
I have tried to create a blob using the pdfBytes
after the watermarking. After the blob is created I thought I could add it to an anchor attached to the DOM.
When commenting out the blob
and anchor
code, two errors occur:
- ReferenceError: Blob is not defined
- ReferenceError: document is not defined (possibility because there is no DOM to attach the anchor link)
At this point I am only able to print the pdfBytes
as json, I am not able to create and download the actual watermarked PDF file.
Is there a way to auto download the pdfBytes
as a PDF file when the API is called?
UPDATE
Working code below after changing modifyPDF
to return a buffer:
ANSWER
Answered 2021-Sep-25 at 09:01Change your modifyPDF
to return a buffer
QUESTION
I use pdflib
and it works perfectly for me. But I can't get it to write a message on all the pages of the PDF.
How can I make it so that, if I upload a 7 pages PDF, the message appears on all 7 pages. And if I upload a 5 pages PDF, it appears on all 5 pages.
And I tried using if
but I didn't get it in the end.
ANSWER
Answered 2021-Apr-01 at 13:44Not sure if it is the "diagonal message" that you are trying to write on all pages but if so, instead of only getting the first page with const firstPage = pages[0]
you should iterate on all pages
to use drawText()
on each page.
QUESTION
My environment is node v12.16.1 with typescript added.
I am using pdf-lib v1.16.0
(https://www.npmjs.com/package/pdf-lib) in order to fill the form for given PDF file. Library source code can be found here https://github.com/Hopding/pdf-lib and more on docs here https://pdf-lib.js.org/.
Regarding fonts pdf-lib
has a set of called StandardFonts
which is provided inside the lib.
ANSWER
Answered 2021-Feb-07 at 18:18From the specs https://www.npmjs.com/package/pdf-lib#embed-font-and-measure-text
pdf-lib relies on a sister module to support embedding custom fonts: @pdf-lib/fontkit. You must add the @pdf-lib/fontkit module to your project and register it using pdfDoc.registerFontkit(...) before embedding custom fonts.
We have to npm i --save @pdf-lib/fontkit
and we have to have source from where which we will read the font. In my case I have added .otf
file in project and loaded font. Files are structured like on the image:
QUESTION
I'm trying to quickly write a simple tool in NodeJS using pdf-lib. pdf-lib appears to be designed to use promises and async/await, but I don't want the extra code complexity of async/await for such a simple tool.
How can I use functions that return a promise without the extra bother of async/await?
...ANSWER
Answered 2021-Jan-27 at 05:07Since the library primarily uses Promises, you will have to learn how to use Promises regardless, if you want to be able to use the library.
If you think async
/await
will be too difficult, you can construct .then
chains instead. When you start with a Promise or have a Promise inside a .then
, make another .then
, whose callback will run when the Promise resolves. For example, this:
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