How to convert PDF to JPEG from uploaded file (node for PDF to image API in JavaScript using PDF.co Web API

How to convert PDF to JPEG from uploaded file (node for PDF to image API in JavaScript: Step By Step Tutorial

Every ByteScout tool contains example JavaScript source codes that you can find here or in the folder with installed ByteScout product. PDF to image API in JavaScript can be implemented with PDF.co Web API. PDF.co Web API is the Web API with a set of tools for documents manipulation, data conversion, data extraction, splitting and merging of documents. Includes image recognition, built-in OCR, barcode generation and barcode decoders to decode bar codes from scans, pictures and pdf.

This rich sample source code in JavaScript for PDF.co Web API includes the number of functions and options you should do calling the API to implement PDF to image API. Sample code in JavaScript is all you need. Copy-paste it to your the code editor, then add a reference to PDF.co Web API and you are ready to try it! Code testing will allow the function to be tested and work properly with your data.

PDF.co Web API – free trial version is on available our website. Also, there are other code samples to help you with your JavaScript application included into trial version.

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ConvertPdfToJpegFromUploadedFile.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 PDF file const SourceFile = "./sample.pdf"; // Comma-separated list of page indices (or ranges) to process. Leave empty for all pages. Example: '0,2-5,7-'. const Pages = ""; // PDF document password. Leave empty for unprotected documents. const Password = ""; // 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 PDF FILE TO JPEG convertPdfToJpeg(API_KEY, uploadedFileUrl, Password, Pages); }) .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=${path.basename(SourceFile)}`; let reqOptions = { host: "api.pdf.co", path: encodeURI(queryPath), headers: { "x-api-key": API_KEY } }; // Send request https.get(reqOptions, (response) => { response.on("data", (d) => { let data = JSON.parse(d); if (data.error == false) { // Return presigned url we received resolve([data.presignedUrl, data.url]); } else { // Service reported error console.log("getPresignedUrl(): " + data.message); } }); }) .on("error", (e) => { // Request error console.log("getPresignedUrl(): " + e); }); }); } function uploadFile(apiKey, localFile, uploadUrl) { return new Promise(resolve => { fs.readFile(SourceFile, (err, data) => { request({ method: "PUT", url: uploadUrl, body: data, headers: { "Content-Type": "application/octet-stream" } }, (err, res, body) => { if (!err) { resolve(); } else { console.log("uploadFile() request error: " + e); } }); }); }); } function convertPdfToJpeg(apiKey, uploadedFileUrl, password, pages) { // Prepare URL for `PDF To JPEG` API call var queryPath = `/v1/pdf/convert/to/jpg?password=${password}&pages=${pages}&url=${uploadedFileUrl}&async=True`; let reqOptions = { host: "api.pdf.co", path: encodeURI(queryPath), method: "GET", headers: { "x-api-key": API_KEY } }; // Send request https.get(reqOptions, (response) => { response.on("data", (d) => { response.setEncoding("utf8"); // Parse JSON response let data = JSON.parse(d); if (data.error == false) { console.log(`Job #${data.jobId} has been created!`); checkIfJobIsCompleted(data.jobId, data.url); } else { // Service reported error console.log("convertPdfToJpeg(): " + data.message); } }); }) .on("error", (e) => { // Request error console.log("convertPdfToJpeg(): " + e); }); } function checkIfJobIsCompleted(jobId, resultFileUrlJson) { let queryPath = `/v1/job/check?jobid=${jobId}`; let reqOptions = { host: "api.pdf.co", path: encodeURI(queryPath), method: "GET", headers: { "x-api-key": API_KEY } }; https.get(reqOptions, (response) => { response.on("data", (d) => { response.setEncoding("utf8"); // Parse JSON response let data = JSON.parse(d); console.log(`Checking Job #${jobId}, Status: ${data.status}, Time: ${new Date().toLocaleString()}`); if (data.status == "working") { // Check again after 3 seconds setTimeout(function(){checkIfJobIsCompleted(jobId, resultFileUrlJson)} , 3000); } else if (data.status == "success") { request({ method: 'GET', uri: resultFileUrlJson, gzip: true }, function (error, response, body) { // Parse JSON response let respJsonFileArray = JSON.parse(body); let page = 1; respJsonFileArray.forEach((url) => { var localFileName = `./page${page}.jpg`; var file = fs.createWriteStream(localFileName); https.get(url, (response2) => { response2.pipe(file) .on("close", () => { console.log(`Generated JPEG file saved as "${localFileName} file."`); }); }); page++; }, this); }); } else { console.log(`Operation ended with status: "${data.status}".`); } }) }); }

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