temp.txt

const express = require('express');
const path=require('path');
const bodyParser=require('body-parser');
const app = express();

app.set('view engine','ejs');
app.set('views',path.join(__dirname,'views'))
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({extended:true}));

//static file path
app.use(express.static(path.join(__dirname,'public')));

var fs = require('fs');

var pdfjsLib = require('pdfjs-dist');
pdfjsLib.workerSrc ="build/pdf.worker.js";

app.get('/', function (req, res) {

var Canvas = require('canvas-prebuilt');
var assert = require('assert');

function NodeCanvasFactory() {}
NodeCanvasFactory.prototype = {
  create: function NodeCanvasFactory_create(width, height) {
    assert(width > 0 && height > 0, 'Invalid canvas size');
    var canvas = new Canvas(width, height);
    var context = canvas.getContext('2d');
    return {
      canvas: canvas,
      context: context,
    };
  },

  reset: function NodeCanvasFactory_reset(canvasAndContext, width, height) {
    assert(canvasAndContext.canvas, 'Canvas is not specified');
    assert(width > 0 && height > 0, 'Invalid canvas size');
    canvasAndContext.canvas.width = width;
    canvasAndContext.canvas.height = height;
  },

  destroy: function NodeCanvasFactory_destroy(canvasAndContext) {
    assert(canvasAndContext.canvas, 'Canvas is not specified');

    canvasAndContext.canvas.width = 0;
    canvasAndContext.canvas.height = 0;
    canvasAndContext.canvas = null;
    canvasAndContext.context = null;
  },
};


// Relative path of the PDF file.
var pdfURL = 'web/test.pdf';

// Read the PDF file into a typed array so PDF.js can load it.
var rawData = new Uint8Array(fs.readFileSync(pdfURL));

// Load the PDF file.
const source = {
  data: rawData,
  nativeImageDecoderSupport: 'none',
  disableFontFace: true
} 
pdfjsLib.getDocument(source).then(function (pdfDocument) {
  console.log('# PDF document loaded.');

  // Get the first page.
  pdfDocument.getPage(1).then(function (page) {
    // Render the page on a Node canvas with 100% scale.
    var viewport = page.getViewport(1.0);
    var canvasFactory = new NodeCanvasFactory();
    var canvasAndContext = canvasFactory.create(viewport.width, viewport.height);
    var renderContext = {
      canvasContext: canvasAndContext.context,
      viewport: viewport,
      canvasFactory: canvasFactory
    };

    page.render(renderContext).then(function () {
      // Convert the canvas to an image buffer.
      var image = canvasAndContext.canvas.toBuffer();
      fs.writeFile('output.png', image, function (error) {
        if (error) {
          console.error('Error: ' + error);
        } else {
          console.log('Finished converting first page of PDF file to a PNG image.');
        }
      });
    });
  });
}).catch(function(reason) {
  console.log(reason);
});





  res.render('index');
});



/* Any copyright is dedicated to the Public Domain.
 * http://creativecommons.org/publicdomain/zero/1.0/ */

//
// Basic node example that prints document metadata and text content.
// Requires single file built version of PDF.js -- please run
// `gulp singlefile` before running the example.
//



// Loading file from file system into typed array



app.listen(3000, function () {
  console.log('Example app listening on port 3000!');
});