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Create react app - how to copy pdf.worker.js file from pdfjs-dist/build to your project's output folder?

stackoverflow.com › questions › 65740268 › create-react-app-how-to-copy-pdf-worker-js-file-from-pdfjs-dist-build-to-your

Install pdfjs-dist

import { Document, Page, pdfjs } from "react-pdf";
import pdfjsWorker from "pdfjs-dist/build/pdf.worker.entry";

pdfjs.GlobalWorkerOptions.workerSrc = pdfjsWorker;

Reference: https://github.com/mozilla/pdf.js/issues/8305

UPDATE

react-pdf >= 9.0.0

import { Document, Page, pdfjs } from "react-pdf";
import { WorkerMessageHandler } from "pdfjs-dist/build/pdf.worker.min.mjs";

pdfjs.GlobalWorkerOptions.workerSrc = new URL(
  WorkerMessageHandler,
  import.meta.url
).toString();

This also fixed a known issue:

Failed to load module script: Expected a JavaScript-or-Wasm module script but the server responded with a MIME type of "application/octet-stream". Strict MIME type checking is enforced for module scripts per HTML spec.

https://github.com/wojtekmaj/react-pdf/issues/1825

Answer from lissettdm on Stack Overflow

Mozilla

mozilla.github.io › pdf.js › examples

PDF.js - Examples

Remember though that PDF.js uses promises, and the above will return a PDFDocumentLoadingTask instance that has a promise property which is resolved with the document object.

Stack Overflow

stackoverflow.com › questions › 65740268 › create-react-app-how-to-copy-pdf-worker-js-file-from-pdfjs-dist-build-to-your

reactjs - Create react app - how to copy pdf.worker.js file from pdfjs-dist/build to your project's output folder? - Stack Overflow

Top answer

1 of 12

Install pdfjs-dist

import { Document, Page, pdfjs } from "react-pdf";
import pdfjsWorker from "pdfjs-dist/build/pdf.worker.entry";

pdfjs.GlobalWorkerOptions.workerSrc = pdfjsWorker;

Reference: https://github.com/mozilla/pdf.js/issues/8305

UPDATE

react-pdf >= 9.0.0

import { Document, Page, pdfjs } from "react-pdf";
import { WorkerMessageHandler } from "pdfjs-dist/build/pdf.worker.min.mjs";

pdfjs.GlobalWorkerOptions.workerSrc = new URL(
  WorkerMessageHandler,
  import.meta.url
).toString();

This also fixed a known issue:

Failed to load module script: Expected a JavaScript-or-Wasm module script but the server responded with a MIME type of "application/octet-stream". Strict MIME type checking is enforced for module scripts per HTML spec.

https://github.com/wojtekmaj/react-pdf/issues/1825

2 of 12

found a more efficient way of including the worker by including the library from the dependencies of react-pdf itself, this way you will never get a version mismatch like this The API version "2.3.45" does not match the Worker version "2.1.266"

if you install pdfjs-dist manually you will have to check react pdf dependency version on every build

import { Document, Page, pdfjs } from "react-pdf";
import pdfjsWorker from "react-pdf/node_modules/pdfjs-dist/build/pdf.worker.entry";

pdfjs.GlobalWorkerOptions.workerSrc = pdfjsWorker;

see similar error on pdfjs library : https://github.com/mozilla/pdf.js/issues/10997

hope it helps people

Mozilla

mozilla.github.io › pdf.js › getting_started

PDF.js - Getting Started

├── docs/ - website source ... dependency versions └── package.json - package definition and dependencies · With the prebuilt or source version, open web/viewer.html in a browser and the test pdf should load. Note: the worker is not enabled for file:// urls, so use ...

reddit.com › r/nextjs › how do i solve this issue: error: setting up fake worker failed: "cannot find module '/pdf.worker.js' ?

r/nextjs on Reddit: How do I solve this issue: Error: Setting up fake worker failed: "Cannot find module '/pdf.worker.js' ?

August 3, 2023 - React-pdf uses under the hood pdfjs, and you should follow their configuration instructions in order to properly make it work for Next.js: import { pdfjs } from 'react-pdf'; pdfjs.GlobalWorkerOptions.workerSrc = new URL( 'pdfjs-dist/build/pdf.worker.min.js', import.meta.url, ).toString();

React PDF Viewer

react-pdf-viewer.dev › docs › basic-usage

Basic usage - React PDF Viewer

https://cdnjs.cloudflare.com/ajax/libs/pdf.js/3.4.120/pdf.worker.min.js · or download and store it on your server. Note · It's very important to note that the worker version and the `pdfjs` package (mentioned in the Install pdfjs library section of Getting started) have to be the same.

npm

npmjs.com › package › pdfjs-dist

pdfjs-dist - npm

Generic build of Mozilla's PDF.js library.. Latest version: 5.4.449, last published: 12 days ago. Start using pdfjs-dist in your project by running `npm i pdfjs-dist`. There are 2279 other projects in the npm registry using pdfjs-dist.

      » npm install pdfjs-dist

Published Nov 29, 2025

Version 5.4.449

Repository https://github.com/mozilla/pdf.js

Homepage https://mozilla.github.io/pdf.js/

GitHub

github.com › mozilla › pdfjs-dist › blob › master › build › pdf.worker.js.map

pdfjs-dist/build/pdf.worker.js.map at master · mozilla/pdfjs-dist

Generic build of PDF.js library. . Contribute to mozilla/pdfjs-dist development by creating an account on GitHub.

Author mozilla

GitHub

github.com › mozilla › pdf.js

GitHub - mozilla/pdf.js: PDF Reader in JavaScript

PDF Reader in JavaScript. Contribute to mozilla/pdf.js development by creating an account on GitHub.

Starred by 52.4K users

Forked by 10.5K users

Languages JavaScript 71.3% | Fluent 25.5% | CSS 2.2%

GitHub

github.com › mozilla › pdf.js › issues › 8305

What should be the value for `workerSrc`? · Issue #8305 · mozilla/pdf.js

March 13, 2017 - a Node require spec that'll get resolved and bundled into the same file via webpack & node? e.g. PDFJS.workerSrc = 'pdfjs-dist/build/pdf.worker.js';

Published Apr 17, 2017

Find elsewhere

Google Bing Mojeek

GitHub

github.com › wojtekmaj › react-pdf

GitHub - wojtekmaj/react-pdf: Display PDFs in your React app as easily as if they were images.

For React-PDF to work, PDF.js worker needs to be provided.

Starred by 10.7K users

Forked by 981 users

Languages TypeScript 94.3% | CSS 5.6% | HTML 0.1%

npm

npmjs.com › package › react-pdf-js-worker

react-pdf-js-worker - npm

A React component to wrap PDF.js. Latest version: 2.0.0, last published: 9 years ago. Start using react-pdf-js-worker in your project by running `npm i react-pdf-js-worker`. There are no other projects in the npm registry using react-pdf-js-worker.

      » npm install react-pdf-js-worker

Published Aug 29, 2016

Version 2.0.0

Author Mike Cousins

Repository https://github.com/truckingsim/react-pdf-js-worker

Homepage https://github.com/truckingsim/react-pdf-js-worker

Snyk

snyk.io › advisor › pdfjs-dist › functions › pdfjs-dist.globalworkeroptions

How to use the pdfjs-dist.GlobalWorkerOptions function in pdfjs-dist | Snyk

async function createPDFViewer() { PDFJS.GlobalWorkerOptions.workerSrc = '../../../node_modules/pdfjs-dist/build/pdf.worker.js'; const container = document.getElementById('viewerContainer'); if (! container) { throw new Error("No container"); } const pdfLinkService = new PDFLinkService(); // the text area is working!

jsDelivr

jsdelivr.com › package › npm › pdf.worker

pdf.worker CDN by jsDelivr - A CDN for npm and GitHub

October 10, 2023 - A free, fast, and reliable CDN for pdf.worker. This is a required file for pdf js to work

Published Oct 10, 2023

Google Groups

groups.google.com › g › mozilla.dev.pdf-js › c › 8B6iCsj5Hkg

pdf.worker.js and other js files make for a large client download

3. Configure HTTP server to support caching and compression. The pdf.js (which is smaller one) is only needed for initial loading, pdf.worker.js is loaded when document is about to be loaded. So UI/web page will be loaded faster to give user some control/information.

GitHub

github.com › mozilla › pdf.js › issues › 10813

March 19, 2019 - I've had problems that many had regarding using pdf.worker.js inside my react application (I build a wrapper on pdf.js for react). I'm using Create React App, I tried many things from hosting from cloud: PdfJsLib.GlobalWorkerOptions.workerSrc = PDFJS_WORKER_CLOUD_URL; this works but I must make it work locally.

Published May 13, 2019

cdnjs

cdnjs.com › home › libraries › pdf.js › 2.6.347

pdf.js - Libraries - cdnjs - The #1 free and open source CDN built to make life easier for developers

https://cdnjs.cloudflare.com/ajax/libs/pdf.js/2.6.347/pdf.worker.min.js · https://cdnjs.cloudflare.com/ajax/libs/pdf.js/2.6.347/pdf_viewer.css · https://cdnjs.cloudflare.com/ajax/libs/pdf.js/2.6.347/pdf_viewer.js · https://cdnjs.cloudflare.com/ajax/libs/pdf.js/2.6.347/pdf_viewer.js.map ·

Nutrient

nutrient.io › blog › sdk › how to build a reactjs viewer with pdfjs

Build a React PDF viewer with PDF.js and Next.js: Step-by-step tutorial

July 16, 2025 - PDF.js uses web workers to offload the parsing and rendering of PDFs to a background thread, improving performance. To keep the setup simple, manually copy the worker script to the public directory, which is served statically by Next.js.

Observable

observablehq.com › @hastebrot › how-pdfjs-loads-its-worker-source

how pdfjs loads its worker source / Benjamin | Observable

April 27, 2020 - Build files can be found at https://github.com/mozilla/pdfjs-dist/tree/v2.4.456/build and https://unpkg.com/browse/[email protected]/build/. Example files can be found at https://github.com/mozilla/pdf.js/tree/v2.4.456/examples

GitHub

github.com › wojtekmaj › react-pdf › issues › 1855

Can't resolve 'pdfjs-dist/build/pdf.worker.min.mjs in Nextjs 14 app router · Issue #1855 · wojtekmaj/react-pdf

August 13, 2024 - If I have a problem with PDF rendering, I checked if my PDF renders properly in PDF.js demo · import { Box, CircularProgress, Pagination, Stack, Typography } from '@mui/material'; import React, { useState } from 'react'; import { DocumentText } from 'iconsax-react'; import 'react-pdf/dist/esm/Page/AnnotationLayer.css'; import 'react-pdf/dist/esm/Page/TextLayer.css'; import { Document, Page, pdfjs } from 'react-pdf'; pdfjs.GlobalWorkerOptions.workerSrc = new URL('pdfjs-dist/build/pdf.worker.min.mjs', import.meta.url).toString(); const options = { cMapUrl: '/cmaps/', standardFontDataUrl: '/stan

Published Aug 13, 2024

Skool

skool.com › universityofcode › solved-pdfjs-worker-optiosn-url-issue

SOLVED pdfjs worker optiosn url issue · University of Code

pdfjs.GlobalWorkerOptions.workerSrc = `//cdnjs.cloudflare.com/ajax/libs/pdf.js/${pdfjs.version}/pdf.worker.min.js`;