How to generate PDF from large HTML file for HTML to PDF API in JavaScript with 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

      
var https = require("https"); var path = require("path"); var fs = require("fs"); // The authentication key (API Key). // Get your own by registering at https://app.pdf.co/documentation/api const API_KEY = "******************************"; // HTML Input const inputHtml = "./sample.html"; // Destination PDF file name const DestinationFile = "./result.pdf"; // Prepare requests params as JSON // See documentation: https://apidocs.pdf.co/?#1-json-pdfconvertfromhtml var parameters = {}; // Input HTML code to be converted. Required. parameters["html"] = fs.readFileSync(inputHtml, "utf8"); // Name of resulting file parameters["name"] = path.basename(DestinationFile); // Set to css style margins like 10 px or 5px 5px 5px 5px. parameters["margins"] = "5px 5px 5px 5px"; // Can be Letter, A4, A5, A6 or custom size like 200x200 parameters["paperSize"] = "Letter"; // Set to Portrait or Landscape. Portrait by default. parameters["orientation"] = "Portrait"; // true by default. Set to false to disbale printing of background. parameters["printBackground"] = true; // If large input document, process in async mode by passing true parameters["async"] = true; // Set to HTML for header to be applied on every page at the header. parameters["header"] = ""; // Set to HTML for footer to be applied on every page at the bottom. parameters["footer"] = ""; // Convert JSON object to string var jsonPayload = JSON.stringify(parameters); // Prepare request to `HTML To PDF` API endpoint var url = '/v1/pdf/convert/from/html'; var reqOptions = { host: "api.pdf.co", path: url, 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) => { // Parse JSON response var data = JSON.parse(d); if (data.error == false) { console.log(`Job #${data.jobId} has been created!`); checkIfJobIsCompleted(data.jobId, data.url); } else { // Service reported error console.log(data.message); } }); }).on("error", (e) => { // Request error console.log(e); }); // Write request data postRequest.write(jsonPayload); postRequest.end(); function checkIfJobIsCompleted(jobId, resultFileUrl) { let queryPath = `/v1/job/check`; let reqOptions = { host: "api.pdf.co", path: encodeURI(queryPath), method: "GET", headers: { "x-api-key": API_KEY } }; https.get(reqOptions, (response) => { response.on("data", (d) => { response.setEncoding("utf8"); // Parse JSON response let data = JSON.parse(d); console.log(`Checking Job #${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}".`); } }) }); }

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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