How to Convert DOC to PDF from Uploaded File (Node for DOC to PDF API in JavaScript with PDF.co Web API

In this article we’ll take a look at transforming a word document file to PDF using PDF.co API Endpoint. Before we move to details let’s have a quick introduction of PDF.co.

PDF.co Web API is the REST API that provides a set of data extraction functions, tools for documents manipulation, splitting and merging of PDF files. Includes built-in OCR, images recognition, can generate and read barcodes from images, scans and PDF.

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Check out these parts to convert DOC to PDF from the uploaded file (Node.js):

  1. Source Code
  2. Output
  3. Analysis

The following is the full nodejs source code.

Source Code

var https = require("https");
var path = require("path");
var fs = require("fs");

// `request` module is required for file upload.
// Use "npm install request" command to install.
var request = require("request");

// The authentication key (API Key).
// Get your own by registering at https://app.pdf.co/documentation/api
const API_KEY = "***********************************";


// Source DOC or DOCX file
const SourceFile = "./sample.docx";
// Destination PDF file name
const DestinationFile = "./result.pdf";


// 1. RETRIEVE PRESIGNED URL TO UPLOAD FILE.
getPresignedUrl(API_KEY, SourceFile)
    .then(([uploadUrl, uploadedFileUrl]) => {
        // 2. UPLOAD THE FILE TO CLOUD.
        uploadFile(API_KEY, SourceFile, uploadUrl)
            .then(() => {
                // 3. CONVERT UPLOADED DOC (DOCX) FILE TO PDF
                convertDocToPdf(API_KEY, uploadedFileUrl, DestinationFile);
            })
            .catch(e => {
                console.log(e);
            });
    })
    .catch(e => {
        console.log(e);
    });


function getPresignedUrl(apiKey, localFile) {
    return new Promise(resolve => {
        // Prepare request to `Get Presigned URL` API endpoint
        let queryPath = `/v1/file/upload/get-presigned-url?contenttype=application/octet-stream&name=${path.basename(SourceFile)}`;
        let reqOptions = {
            host: "api.pdf.co",
            path: encodeURI(queryPath),
            headers: { "x-api-key": API_KEY }
        };
        // Send request
        https.get(reqOptions, (response) => {
            response.on("data", (d) => {
                let data = JSON.parse(d);
                if (data.error == false) {
                    // Return presigned url we received
                    resolve([data.presignedUrl, data.url]);
                }
                else {
                    // Service reported error
                    console.log("getPresignedUrl(): " + data.message);
                }
            });
        })
            .on("error", (e) => {
                // Request error
                console.log("getPresignedUrl(): " + e);
            });
    });
}

function uploadFile(apiKey, localFile, uploadUrl) {
    return new Promise(resolve => {
        fs.readFile(SourceFile, (err, data) => {
            request({
                method: "PUT",
                url: uploadUrl,
                body: data,
                headers: {
                    "Content-Type": "application/octet-stream"
                }
            }, (err, res, body) => {
                if (!err) {
                    resolve();
                }
                else {
                    console.log("uploadFile() request error: " + e);
                }
            });
        });
    });
}

function convertDocToPdf(apiKey, uploadedFileUrl, destinationFile) {
    // Prepare URL for `DOC To PDF` API call
    let queryPath = `/v1/pdf/convert/from/doc`;

    // JSON payload for api request
    var jsonPayload = JSON.stringify({
        name: path.basename(destinationFile), url: uploadedFileUrl
    });

    var reqOptions = {
        host: "api.pdf.co",
        method: "POST",
        path: queryPath,
        headers: {
            "x-api-key": apiKey,
            "Content-Type": "application/json",
            "Content-Length": Buffer.byteLength(jsonPayload, 'utf8')
        }
    };

    // Send request
    var postRequest = https.request(reqOptions, (response) => {
        response.on("data", (d) => {
            response.setEncoding("utf8");
            // Parse JSON response
            let data = JSON.parse(d);
            if (data.error == false) {
                // Download PDF file
                var file = fs.createWriteStream(destinationFile);
                https.get(data.url, (response2) => {
                    response2.pipe(file)
                        .on("close", () => {
                            console.log(`Generated PDF file saved as "${destinationFile}" file.`);
                        });
                });
            }
            else {
                // Service reported error
                console.log("readBarcodes(): " + data.message);
            }
        });
    })
        .on("error", (e) => {
            // Request error
            console.log("readBarcodes(): " + e);
        });

    // Write request data
    postRequest.write(jsonPayload);
    postRequest.end();
}

Now, let’s review the output GIF.

Output

PDFco Doc to PDF Nodejs

Analysis

Now, let’s analyze the main logic of this program. We can logically divide this code into the following steps.

  • Upload the input document to PDF.co and get the uploaded URL back
  • Consume the PDF.co endpoint ‘/v1/pdf/convert/from/doc’ to get converted PDF
  • Write the result PDF to the folder

Please note that PDF.co requires API key to be passed in the header for authenticating its requests. You can get your the PDF.co API Key by signing up here.

To get more out of this article, do try running this program code in your machine. Visit PDF.co documentations for more details.

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