PDF.co Web API – CSV To PDF API – JavaScript – Convert CSV To PDF From Uploaded File (Node.js)

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app.js

      
/*jshint esversion: 6 */

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 CSV file
const SourceFile = "./sample.csv";
// 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 CSV FILE TO PDF
                convertCsvToPdf(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 convertCsvToPdf(apiKey, uploadedFileUrl, destinationFile) {
    // Prepare URL for `CSV To PDF` API call
    let queryPath = `/v1/pdf/convert/from/csv`;

    // 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();
}


    

package.json

      
{
  "name": "test",
  "version": "1.0.0",
  "description": "PDF.co",
  "main": "app.js",
  "scripts": {
  },
  "keywords": [
    "pdf.co",
    "web",
    "api",
    "bytescout",
    "api"
  ],
  "author": "ByteScout & PDF.co",
  "license": "ISC",
  "dependencies": {
    "request": "^2.88.2"
  }
}

    

Output

Though this program is self-explanatory, and we’ve also seen the output, let’s review important code snippets a bit.

Initially we’re injecting all necessary package dependencies such as https, path and fs. We’re also injecting external libraries such as requst. We’re also preparing necessary information for the API call such as PDF.co API Key (API_KEY), Input file path (SourceFile) and Destination file path (DestinationFile).

We can divide this program into two local parts, first we’re uplaoding source file to PDF.co Cloud and getting the public URL; secondly, we’re using this public URL for PDF and processing CSV to PDF conversion.

PDF.co API endpoint /v1/file/upload/get-presigned-url is used to get a pre-signed URL of the source file. In the request we’re passing the input PDF file name where as in response it’s returning a public URL (data.url) along with the pre-signed URL (data.presignedUrl). This Pre-signed URL is used to upload the actual source file with PUT request. After the source file is uplaoded to a pre-signed URL public URL (data.url) now points to the source file. This public URL is temporary and only available for a few hours for security reasons.

The API endpoint /v1/pdf/convert/from/csv is used to create PDF from CSV file. In order to create PDF.co request we’re creating the JSON payload with minimal parameters such as the source file URL (url) and the result file path (name). The PDF.co API key is used in the request header (x-api-key) for authentication purposes. In reponse, PDF.co is responding with output PDF URL (data.url) which contains all CSV info as shown in the output.

In this sample, we’re using the basic request parameters to process CSV to PDF conversion. However, we can use advanced input parameters to optimize the request as per our needs. Please refer to this link to access PDF.co API documentation.

Please try this sample in your machine to get most of out this article. Thank you for reading!

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