How to merge PDF documents from uploaded file (node for PDF merging API in JavaScript with PDF.co Web API

What is PDF.co Web API? It is the flexible Web API that includes full set of functions from e-signature requests to data extraction, OCR, images recognition, pdf splitting and pdf splitting. Can also generate barcodes and read barcodes from images, scans and pdf.

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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 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 = `/v1/file/upload/get-presigned-url?contenttype=application/octet-stream&name=${path.basename(localFile)}`; let reqOptions = { host: "api.pdf.co", path: encodeURI(queryPath), headers: { "x-api-key": API_KEY } }; // Send request https.get(reqOptions, (response) => { response.on("data", (d) => { let data = JSON.parse(d); if (data.error == false) { // Return presigned url we received resolve([data.presignedUrl, data.url]); } else { // Service reported error console.log("getPresignedUrl(): " + data.message); } }); }) .on("error", (e) => { // Request error console.log("getPresignedUrl(): " + e); }); }); } function uploadFile(sourceFile, uploadUrl) { return new Promise(resolve => { fs.readFile(sourceFile, (err, data) => { request({ method: "PUT", url: uploadUrl, body: data, headers: { "Content-Type": "application/octet-stream" } }, (err, res, body) => { if (!err) { resolve(); } else { console.log("uploadFile() request error: " + e); } }); }); }); } function mergePDFDocuments(SourceFiles, DestinationFile) { // Prepare request to `Merge PDF` API endpoint var queryPath = `/v1/pdf/merge`; // JSON payload for api request var jsonPayload = JSON.stringify({ name: path.basename(DestinationFile), url: SourceFiles.join(",") }); var reqOptions = { host: "api.pdf.co", method: "POST", path: queryPath, headers: { "x-api-key": API_KEY, "Content-Type": "application/json", "Content-Length": Buffer.byteLength(jsonPayload, 'utf8') } }; // Send request var postRequest = https.request(reqOptions, (response) => { response.on("data", (d) => { // Parse JSON response var data = JSON.parse(d); if (data.error == false) { // Download PDF file var file = fs.createWriteStream(DestinationFile); https.get(data.url, (response2) => { response2.pipe(file) .on("close", () => { console.log(`Generated PDF file saved as "${DestinationFile}" file.`); }); }); } else { // Service reported error console.log(data.message); } }); }).on("error", (e) => { // Request error console.log(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" } }

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