Node.js Express Word Document DOCX to PDF Document Using LibreOffice Library in Javascript

Welcome folks today in this blog post we will be building word document to pdf document in browser using libreOffice in node.js and express using Javascript. All the source code of the application is shown below.

Get Started

In order to get started you need to make a new node.js project using the below command as shown below

npm init -y

npm i multer

npm i express

npm i libreoffice-convert

After that you need to make an index.html file and copy paste the following code

index.html

<!DOCTYPE html>
<html>
  <head>
    <title>DOCX to PDF Converter</title>
    <link
      rel="stylesheet"
      href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css"
    />
  </head>
  <body>
      <div class="container">
          <h1 class="text-center">
              DOCX to PDF Converter
          </h1>
          <form action="/docxtopdfdemo" method="post" enctype="multipart/form-data">
            <div class="form-group">
                <input type="file" name="file" id="" required class="form-control">
            </div>
            <div class="form-group">
                <button class="btn btn-danger btn-block">
                    Convert to DOCX
                </button>
            </div>
        </form>
      </div>
</body>
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
</html>

<!DOCTYPE html>

<html>

<head>

<title>DOCX to PDF Converter</title>

<link

rel="stylesheet"

href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css"

</head>

<body>

DOCX to PDF Converter

</h1>

</div>

Convert to DOCX

</button>

</div>

</form>

</div>

</body>

</html>

As you can see we have the input field where we allow the user to upload the docx file to convert to pdf document using the libreoffice library.

And now we need to make a POST request to the docxtodemopdf as shown below in the index.js file which is present inside the root directory

index.js

const express = require("express");

const bodyParser = require("body-parser");

const libre = require('libreoffice-convert');

const fs = require("fs");

const path = require("path");

var outputFilePath;

const multer = require("multer");

const app = express();

app.use(bodyParser.urlencoded({ extended: false }));
app.use(bodyParser.json());

const PORT = process.env.PORT || 5000;

app.use(express.static("public"));

var storage = multer.diskStorage({
  destination: function (req, file, cb) {
    cb(null, "public/uploads");
  },
  filename: function (req, file, cb) {
    cb(
      null,
      file.fieldname + "-" + Date.now() + path.extname(file.originalname)
    );
  },
});


app.get('/docxtopdfdemo',(req,res) => {
  res.render('docxtopdfdemo',{title:"DOCX to PDF Converter - Free Media Tools"})
})

const docxtopdfdemo = function (req, file, callback) {
  var ext = path.extname(file.originalname);
  if (
    ext !== ".docx" &&
    ext !== ".doc"
  ) {
    return callback("This Extension is not supported");
  }
  callback(null, true);
};

const docxtopdfdemoupload = multer({storage:storage,fileFilter:docxtopdfdemo})


app.post('/docxtopdfdemo',docxtopdfdemoupload.single('file'),(req,res) => {
  if(req.file){
    console.log(req.file.path)

    const file = fs.readFileSync(req.file.path);

    outputFilePath = Date.now() + "output.pdf" 

    libre.convert(file,".pdf",undefined,(err,done) => {
      if(err){
        fs.unlinkSync(req.file.path)
        fs.unlinkSync(outputFilePath)

        res.send("some error taken place in conversion process")
      }

      fs.writeFileSync(outputFilePath, done);

      res.download(outputFilePath,(err) => {
        if(err){
          fs.unlinkSync(req.file.path)
        fs.unlinkSync(outputFilePath)

        res.send("some error taken place in downloading the file")
        }

        fs.unlinkSync(req.file.path)
        fs.unlinkSync(outputFilePath)
      })


    })
  }
})

app.listen(PORT, () => {
  console.log(`App is listening on Port ${PORT}`);
});

const express = require("express");

const bodyParser = require("body-parser");

const libre = require('libreoffice-convert');

const fs = require("fs");

const path = require("path");

var outputFilePath;

const multer = require("multer");

const app = express();

app.use(bodyParser.urlencoded({ extended: false }));

app.use(bodyParser.json());

const PORT = process.env.PORT || 5000;

app.use(express.static("public"));

var storage = multer.diskStorage({

destination: function (req, file, cb) {

cb(null, "public/uploads");

filename: function (req, file, cb) {

cb(

null,

file.fieldname + "-" + Date.now() + path.extname(file.originalname)

);

});

app.get('/docxtopdfdemo',(req,res) => {

res.render('docxtopdfdemo',{title:"DOCX to PDF Converter - Free Media Tools"})

})

const docxtopdfdemo = function (req, file, callback) {

var ext = path.extname(file.originalname);

if (

ext !== ".docx" &&

ext !== ".doc"

) {

return callback("This Extension is not supported");

}

callback(null, true);

};

const docxtopdfdemoupload = multer({storage:storage,fileFilter:docxtopdfdemo})

app.post('/docxtopdfdemo',docxtopdfdemoupload.single('file'),(req,res) => {

if(req.file){

console.log(req.file.path)

const file = fs.readFileSync(req.file.path);

outputFilePath = Date.now() + "output.pdf"

libre.convert(file,".pdf",undefined,(err,done) => {

if(err){

fs.unlinkSync(req.file.path)

fs.unlinkSync(outputFilePath)

res.send("some error taken place in conversion process")

}

fs.writeFileSync(outputFilePath, done);

res.download(outputFilePath,(err) => {

if(err){

fs.unlinkSync(req.file.path)

fs.unlinkSync(outputFilePath)

res.send("some error taken place in downloading the file")

}

fs.unlinkSync(req.file.path)

fs.unlinkSync(outputFilePath)

})

}

})

app.listen(PORT, () => {

console.log(`App is listening on Port ${PORT}`);

});

As you can see we are using the libreoffice-convert library to convert the docx to pdf documents inside the web app.