How to merge any documents from uploaded file (node for PDF merging API in JavaScript and PDF.co Web API
PDF.co Web API is the Rest API that provides set of data extraction functions, tools for documents manipulation, splitting and merging of pdf files. Includes built-in OCR, images recognition, can generate 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 Document file. Supports documents, spreadsheets, images as sources.
const SourceFile1 = "./sample1.pdf";
const SourceFile2 = "./sample.docx";
// 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 Documents
mergeDocuments(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=${path.basename(localFile)}`;
let reqOptions = {
host: "api.pdf.co",
path: encodeURI(queryPath),
headers: { "x-api-key": API_KEY }
};
// Send request
https.get(reqOptions, (response) => {
response.on("data", (d) => {
let data = JSON.parse(d);
if (data.error == false) {
// Return presigned url we received
resolve([data.presignedUrl, data.url]);
}
else {
// Service reported error
console.log("getPresignedUrl(): " + data.message);
}
});
})
.on("error", (e) => {
// Request error
console.log("getPresignedUrl(): " + e);
});
});
}
function uploadFile(sourceFile, uploadUrl) {
return new Promise(resolve => {
fs.readFile(sourceFile, (err, data) => {
request({
method: "PUT",
url: uploadUrl,
body: data,
headers: {
"Content-Type": "application/octet-stream"
}
}, (err, res, body) => {
if (!err) {
resolve();
}
else {
console.log("uploadFile() request error: " + e);
}
});
});
});
}
function mergeDocuments(SourceFiles, DestinationFile) {
// Prepare request to `Merge Documents` API endpoint
var queryPath = `/v1/pdf/merge2`;
// JSON payload for api request
var jsonPayload = JSON.stringify({
name: path.basename(DestinationFile), url: SourceFiles.join(","), async: true
});
var reqOptions = {
host: "api.pdf.co",
method: "POST",
path: queryPath,
headers: {
"x-api-key": API_KEY,
"Content-Type": "application/json",
"Content-Length": Buffer.byteLength(jsonPayload, 'utf8')
}
};
// Send request
var postRequest = https.request(reqOptions, (response) => {
response.on("data", (d) => {
// Parse JSON response
var data = JSON.parse(d);
if (data.error == false) {
console.log(`Job #${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);
});
// Write request data
postRequest.write(jsonPayload);
postRequest.end();
}
function checkIfJobIsCompleted(jobId, resultFileUrl) {
let queryPath = `/v1/job/check`;
// JSON payload for api request
let jsonPayload = JSON.stringify({
jobid: jobId
});
let reqOptions = {
host: "api.pdf.co",
path: queryPath,
method: "POST",
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) => {
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}".`);
}
})
});
// 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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