ByteScout Cloud API Server - PDF To Image API - JavaScript - Convert PDF To PNG From Uploaded File (Node.js) - ByteScout

ByteScout Cloud API Server – PDF To Image API – JavaScript – Convert PDF To PNG From Uploaded File (Node.js)

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How to convert PDF to PNG from uploaded file (node for PDF to image API in JavaScript and ByteScout Cloud API Server

How to convert PDF to PNG from uploaded file (node in JavaScript with easy ByteScout code samples to make PDF to image API. Step-by-step tutorial

Quick guide:Learn how to convert PDF to PNG from uploaded file (node in JavaScript. PDF to image API in JavaScript can be applied with ByteScout Cloud API Server. ByteScout Cloud API Server is the ready to deploy Web API Server that can be deployed in less than thirty minutes into your own in-house Windows server (no Internet connnection is required to process data!) or into private cloud server. Can store data on in-house local server based storage or in Amazon AWS S3 bucket. Processing data solely on the server using built-in ByteScout powered engine, no cloud services are used to process your data!.

The SDK samples displayed below below explain how to quickly make your application do PDF to image API in JavaScript with the help of ByteScout Cloud API Server. Open your JavaScript project and simply copy & paste the code and then run your app! Want to see how it works with your data then code testing will allow the function to be tested and work properly.

Trial version of ByteScout is available for free download from our website. This and other source code samples for JavaScript and other programming languages are available.

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ConvertPdfToPngFromUploadedFile.js
      
/*jshint esversion: 6 */ // Please NOTE: In this sample we're assuming Cloud Api Server is hosted at "https://localhost". // If it's not then please replace this with with your hosting url. 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"); // 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(SourceFile) .then(([uploadUrl, uploadedFileUrl]) => { // 2. UPLOAD THE FILE TO CLOUD. uploadFile(SourceFile, uploadUrl) .then(() => { // 3. CONVERT UPLOADED PDF FILE TO PNG convertPdfToPng(uploadedFileUrl, Password, Pages); }) .catch(e => { console.log(e); }); }) .catch(e => { console.log(e); }); function getPresignedUrl(localFile) { return new Promise(resolve => { // Prepare request to `Get Presigned URL` API endpoint let queryPath = `/file/upload/get-presigned-url?contenttype=application/octet-stream&name=${path.basename(SourceFile)}`; let reqOptions = { host: "localhost", path: encodeURI(queryPath) }; // Send request https.get(reqOptions, (response) => { response.on("data", (d) => { let data = JSON.parse(d); if (data.error == false) { // Return presigned url we received resolve([data.presignedUrl, data.url]); } else { // Service reported error console.log("getPresignedUrl(): " + data.message); } }); }) .on("error", (e) => { // Request error console.log("getPresignedUrl(): " + e); }); }); } function uploadFile(localFile, uploadUrl) { return new Promise(resolve => { fs.readFile(SourceFile, (err, data) => { request({ method: "PUT", url: uploadUrl, body: data, headers: { "Content-Type": "application/octet-stream" } }, (err, res, body) => { if (!err) { resolve(); } else { console.log("uploadFile() request error: " + e); } }); }); }); } function convertPdfToPng(uploadedFileUrl, password, pages) { // Prepare URL for `PDF To PNG` API call var queryPath = `/pdf/convert/to/png?password=${password}&pages=${pages}&url=${uploadedFileUrl}`; let reqOptions = { host: "localhost", path: encodeURI(queryPath), method: "GET" }; // 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) { // Download generated PNG files var page = 1; data.urls.forEach((url) => { var localFileName = `./page${page}.png`; var file = fs.createWriteStream(localFileName); https.get(url, (response2) => { response2.pipe(file) .on("close", () => { console.log(`Generated PNG file saved as "${localFileName}" file.`); }); }); page++; }, this); } else { // Service reported error console.log("readBarcodes(): " + data.message); } }); }) .on("error", (e) => { // Request error console.log("readBarcodes(): " + e); }); }

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