Convert PDF To XML From Uploaded File (Node.js) - Async API - JavaScript
PDF To XML sample in JavaScript demonstrating ‘Convert PDF To XML From Uploaded File (Node.js) - Async API’
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
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 = "";
// Destination XML file name
const DestinationFile = "./result.xml";
// 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 XML
convertPdfToXml(API_KEY, uploadedFileUrl, Password, Pages, DestinationFile);
})
.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=${path.basename(SourceFile)}`;
let reqOptions = {
host: "api.pdf.co",
path: encodeURI(queryPath),
headers: { "x-api-key": API_KEY }
};
// Send request
https.get(reqOptions, (response) => {
response.on("data", (d) => {
let data = JSON.parse(d);
if (data.error == false) {
// Return presigned url we received
resolve([data.presignedUrl, data.url]);
}
else {
// Service reported error
console.log("getPresignedUrl(): " + data.message);
}
});
})
.on("error", (e) => {
// Request error
console.log("getPresignedUrl(): " + e);
});
});
}
function uploadFile(apiKey, localFile, uploadUrl) {
return new Promise(resolve => {
fs.readFile(SourceFile, (err, data) => {
request({
method: "PUT",
url: uploadUrl,
body: data,
headers: {
"Content-Type": "application/octet-stream"
}
}, (err, res, body) => {
if (!err) {
resolve();
}
else {
console.log("uploadFile() request error: " + e);
}
});
});
});
}
function convertPdfToXml(apiKey, uploadedFileUrl, password, pages, destinationFile) {
// Prepare request to `PDF To XML` API endpoint
var queryPath = `/v1/pdf/convert/to/xml`;
// JSON payload for api request
var jsonPayload = JSON.stringify({
name: path.basename(destinationFile), password: password, pages: pages, url: uploadedFileUrl, async: true
});
var reqOptions = {
host: "api.pdf.co",
method: "POST",
path: queryPath,
headers: {
"x-api-key": API_KEY,
"Content-Type": "application/json",
"Content-Length": Buffer.byteLength(jsonPayload, 'utf8')
}
};
// Send request
var postRequest = https.request(reqOptions, (response) => {
response.on("data", (d) => {
response.setEncoding("utf8");
// Parse JSON response
let data = JSON.parse(d);
if (data.error == false) {
// Process returned job
console.log(`Job #${data.jobId} has been created!`);
checkIfJobIsCompleted(data.jobId, data.url, destinationFile);
}
else {
// Service reported error
console.log("convertPdfToXml(): " + data.message);
}
});
})
.on("error", (e) => {
// Request error
console.log("convertPdfToXml(): " + e);
});
// Write request data
postRequest.write(jsonPayload);
postRequest.end();
}
function checkIfJobIsCompleted(jobId, resultFileUrl, destinationFile) {
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: ${new Date().toLocaleString()}`);
if (data.status == "working") {
// Check again after 3 seconds
setTimeout(function () {
checkIfJobIsCompleted(jobId, resultFileUrl, destinationFile);
}, 3000);
}
else if (data.status == "success") {
// Download XML file
var file = fs.createWriteStream(destinationFile);
https.get(resultFileUrl, (response2) => {
response2.pipe(file)
.on("close", () => {
console.log(`Generated XML file saved as "${destinationFile}" file.`);
});
});
}
else {
console.log(`Operation ended with status: "${data.status}".`);
}
})
});
// Write request data
postRequest.write(jsonPayload);
postRequest.end();
}
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Download Source Code (.zip)
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