NodeJS Digital Signature

index.js

const signer = require('node-signpdf').default
const fs = require('fs')
const { plainAddPlaceholder } = require('node-signpdf/dist/helpers');

const pdfSignedPath = `./signed.pdf`;
const pdfBuffer = fs.readFileSync(`./source.pdf`);
const certBuffer = fs.readFileSync(`./certificate.p12`);

let inputBuffer = plainAddPlaceholder({
    pdfBuffer,
    reason: 'Signed Certificate.',
    contactInfo: 'admin@hafid.com',
    name: 'Sign App',
    location: 'DKI Jakarta',
    signatureLength: certBuffer.length,
});

const signedPdf = signer.sign(
  inputBuffer,
  certBuffer,
  { asn1StrictParsing : true },
);

fs.writeFileSync(pdfSignedPath, signedPdf);