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node.jshummus.js

How to convert a base64 png to pdf using nodejs?

Is there a way to convert multiple base64 PNG files to PDF?

Thanks

Solution

  • I was able to solve the problem using node-canvas

    const fs = require('fs');
const {createCanvas, loadImage}= require('canvas');

// get the base64 string
const base64String = require("./base64");

loadImage(Buffer.from(base64String, "base64")).then(async (img) => {
  const canvas = createCanvas(img.width, img.height, 'pdf');
  const ctx = canvas.getContext('2d');
  console.log(`w: ${img.width}, h: ${img.height}`);

  ctx.drawImage(img, 0, 0, img.width, img.height);
  const base64image = canvas.toBuffer();
  
  // write the file to a pdf file
  fs.writeFile('simple.pdf', base64image, function(err) {
      console.log('File created');
  });
});

    for more info: https://www.npmjs.com/package/canvas

    Note: solution works not only for png but any image type.

    Then use any pdf library to merge the pdfs like hummus