ByteScout Cloud API Server - PDF Merging API - JavaScript - Merge PDF Documents From Uploaded File (Node.js) - Async API - ByteScout

ByteScout Cloud API Server – PDF Merging API – JavaScript – Merge PDF Documents From Uploaded File (Node.js) – Async API

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How to merge PDF documents from uploaded file (node for PDF merging API in JavaScript using ByteScout Cloud API Server

How to merge PDF documents from uploaded file (node in JavaScript with easy ByteScout code samples to make PDF merging API. Step-by-step tutorial

This page displays the step-by-step instructions and algorithm of how to merge PDF documents from uploaded file (node and how to apply it in your application. ByteScout Cloud API Server helps with PDF merging API in JavaScript. ByteScout Cloud API Server is the ready to use Web API Server that can be deployed in less than 30 minutes into your own in-house server 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 buil-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 merging API in JavaScript with the help of ByteScout Cloud API Server. This JavaScript sample code can be used by copying and pasting into your project. Once done,just compile your project and click Run. You can use these JavaScript sample examples in one or many applications.

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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MergePDFDocumentsFromUploadedFile.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 SourceFile1 = "./sample1.pdf"; const SourceFile2 = "./sample2.pdf"; // Destination PDF file name const DestinationFile = "./result.pdf"; // Upload File-1: - 1. RETRIEVE PRESIGNED URL TO UPLOAD FILE. getPresignedUrl(SourceFile1) .then(([uploadUrl1, uploadedFileUrl1]) => { // Upload File-1: - 2. UPLOAD THE FILE TO CLOUD. uploadFile(SourceFile1, uploadUrl1) .then(() => { // Upload File-2: - 1. RETRIEVE PRESIGNED URL TO UPLOAD FILE. getPresignedUrl(SourceFile2) .then(([uploadUrl2, uploadedFileUrl2]) => { // Upload File-2: - 2. UPLOAD THE FILE TO CLOUD. uploadFile(SourceFile2, uploadUrl2) .then(() => { const SourceFiles = [ uploadedFileUrl1, uploadedFileUrl2 ]; // Perform Merge PDF Documents mergePDFDocuments(SourceFiles, DestinationFile); }) .catch(e => { console.log(e); }); }) .catch(e => { console.log(e); }); }) .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=${path.basename(localFile)}`; let reqOptions = { host: "localhost", path: encodeURI(queryPath) }; // Send request https.get(reqOptions, (response) => { response.on("data", (d) => { let data = JSON.parse(d); if (data.error == false) { // Return presigned url we received resolve([data.presignedUrl, data.url]); } else { // Service reported error console.log("getPresignedUrl(): " + data.message); } }); }) .on("error", (e) => { // Request error console.log("getPresignedUrl(): " + e); }); }); } function uploadFile(sourceFile, uploadUrl) { return new Promise(resolve => { fs.readFile(sourceFile, (err, data) => { request({ method: "PUT", url: uploadUrl, body: data, headers: { "Content-Type": "application/octet-stream" } }, (err, res, body) => { if (!err) { resolve(); } else { console.log("uploadFile() request error: " + e); } }); }); }); } function mergePDFDocuments(SourceFiles, DestinationFile) { // Prepare request to `Merge PDF` API endpoint var queryPath = `/pdf/merge?name=${path.basename(DestinationFile)}&url=${SourceFiles.join(",")}&async=True`; var reqOptions = { host: "localhost", path: encodeURI(queryPath) }; // Send request https.get(reqOptions, (response) => { response.on("data", (d) => { // Parse JSON response var data = JSON.parse(d); if (data.error == false) { console.log(`Job #${data.jobId} has been created!`); checkIfJobIsCompleted(data.jobId, data.url); } else { // Service reported error console.log(data.message); } }); }).on("error", (e) => { // Request error console.log(e); }); } function checkIfJobIsCompleted(jobId, resultFileUrl) { let queryPath = `/job/check?jobid=${jobId}`; let reqOptions = { host: "localhost", path: encodeURI(queryPath), method: "GET" }; https.get(reqOptions, (response) => { response.on("data", (d) => { response.setEncoding("utf8"); // Parse JSON response let data = JSON.parse(d); console.log(`Checking Job #${jobId}, Status: ${data.status}, Time: ${new Date().toLocaleString()}`); if (data.status == "working") { // Check again after 3 seconds setTimeout(function(){ checkIfJobIsCompleted(jobId, resultFileUrl);}, 3000); } else if (data.status == "success") { // Download PDF file var file = fs.createWriteStream(DestinationFile); https.get(resultFileUrl, (response2) => { response2.pipe(file) .on("close", () => { console.log(`Generated PDF file saved as "${DestinationFile}" file.`); }); }); } else { console.log(`Operation ended with status: "${data.status}".`); } }) }); }

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