Nodejs：将文档转换为 PDF

Question

I found some repos, which do not look as they are still maintained:

• https://github.com/gfloyd/node-unoconv
• https://github.com/skmp/node-msoffice-pdf ...

I tried the approach with libreoffice , but the pdf output is so bad, that it is not useable (text on diff. pages etc.).

If possible I would like to avoid starting any background processes and/or saving the file on the server. Best would be solution where I can use buffers. For privacy reasons, I cannot use any external service.

doc buffer -> pdf buffer

Question:

How to convert docs to pdf in nodejs?

Answer 1

For those who might stumble on this question nowadays:

There is cool tool called Gotenberg — Docker-powered stateless API for converting HTML, Markdown and Office documents to PDF. It supports converting DOCs via unoconv .

And I am happen to be an author of JS/TS client for Gotenberg — gotenberg-js-client

I welcome you to use it :)

Answer 2

While I was creating an application I need to convert the doc or docx file uploaded by a user into a pdf file for further analysis. I used npm package libreoffice-convert for this purpose. libreoffice-convert requires libreoffice to be installed on your Linux machine. Here is a sample code that I have used. This code is written in javascript for nodejs based application.

const libre = require('libreoffice-convert');
const path = require('path');
const fs = require('fs').promises;
let lib_convert = promisify(libre.convert)

async function convert(name="myresume.docx") {
  try {
    let arr = name.split('.')
    const enterPath = path.join(__dirname, `/public/Resume/${name}`);
    const outputPath = path.join(__dirname, `/public/Resume/${arr[0]}.pdf`);
    // Read file
    let data = await fs.readFile(enterPath)
    let done = await lib_convert(data, '.pdf', undefined)
    await fs.writeFile(outputPath, done)
    return { success: true, fileName: arr[0] };
  } catch (err) {
    console.log(err)
    return { success: false }
  }
}

You will get a very good quality of pdf.

Answer 3

Belated answer, but you could now try https://www.npmjs.com/package/@nativedocuments/docx-wasm which we have just released (January 2019).

It'll perform the conversion locally, and doesn't require LibreOffice, unoconv or anything else.

const fs = require('fs');
const docx = require("@nativedocuments/docx-wasm");

// init docx engine
docx.init({
    // ND_DEV_ID: "XXXXXXXXXXXXXXXXXXXXXXXXXX",    // goto https://developers.nativedocuments.com/ to get a dev-id/dev-secret
    // ND_DEV_SECRET: "YYYYYYYYYYYYYYYYYYYYYYYYYY", // you can also set the credentials in the enviroment variables
    ENVIRONMENT: "NODE", // required
    LAZY_INIT: true      // if set to false the WASM engine will be initialized right now, usefull pre-caching (like e.g. for AWS lambda)
}).catch( function(e) {
    console.error(e);
});

async function convertHelper(document, exportFct) {
    const api = await docx.engine();
    await api.load(document);
    const arrayBuffer = await api[exportFct]();
    await api.close();
    return arrayBuffer;
}

convertHelper("sample.docx", "exportPDF").then((arrayBuffer) => {
    fs.writeFileSync("sample.pdf", new Uint8Array(arrayBuffer));
}).catch((e) => {
    console.error(e);
});

As you can see from the above code you'll need an API key (freemium model).

Answer 4

To convert a document into PDF we can use Universal Office Converter (unoconv) command line utility.

It can be installed on your OS by any package manager eg To install it on ubuntu using apt-get

sudo apt-get install unoconv

As per documentation of unoconv

If you installed unoconv by hand, make sure you have the required LibreOffice or OpenOffice packages installed

Following example demonstrate how to invoke unoconv utility

unoconv -f pdf sample_document.py

It generates PDF document that contains content of sample_document.py

If you want to use a nodeJS program then you can invoke the command through child process

Find code below that demonstrates how to use child process for using the unoconv for creating PDF

const util = require('util');
const exec = util.promisify(require('child_process').exec);

async function createPDFExample() {
  const { stdout, stderr } = await exec('unoconv -f pdf sample.js');
  console.log('stdout:', stdout);
  console.log('stderr:', stderr);
}

createPDFExample();

Answer 5

Posting a slightly modified version for excel, based upon the answer provided by @shubham singh. I tried it and it worked perfectly.

    const fs = require('fs').promises;
    const path = require('path');
    const { promisify } = require('bluebird');
    const libre = require('libreoffice-convert');
    const libreConvert = promisify(libre.convert);

        // get current working directory
        let workDir = path.dirname(process.mainModule.filename)
        // read excel file
        let data = await fs.readFile(
          `${workDir}/my_excel.xlsx`
        );
        // create pdf file from excel
        let pdfFile = await libreConvert(data, '.pdf', undefined);
        // write new pdf file to directory
        await fs.writeFile(
          `${workDir}/my_pdf.pdf`,
          pdfFile
        );

Answer 6

Docx to pdf A library that converts docx file to pdf.

Installation:

npm install docx-pdf --save

Usage

 var docxConverter = require('docx-pdf');

   docxConverter('./input.docx','./output.pdf',function(err,result){
   if(err){
      console.log(err);
     }
    console.log('result'+result);
 });

its basically docxConverter(inputPath,outPath,function(err,result){
  if(err){
   console.log(err);
  }
   console.log('result'+result);
 });

Output should be output.pdf which will be produced on the output path your provided