Asymmetric encryption and decryption of JSON data in js

asymmEncNdDec.js

var crypto = require("crypto");
var path = require("path");
var fs = require("fs");

var encryptStringWithRsaPublicKey = function(toEncrypt, publicKeyInPemPath) {
    var absolutePath = path.resolve(publicKeyInPemPath);
    var publicKey = fs.readFileSync(absolutePath, "utf8");
    var buffer = Buffer.from(JSON.stringify(toEncrypt));
    var encrypted = crypto.publicEncrypt(publicKey, buffer);
    return encrypted.toString("base64");
};

var decryptStringWithRsaPrivateKey = function(toDecrypt, privateKeyInPemPath) {
    var absolutePath = path.resolve(privateKeyInPemPath);
    var privateKey = fs.readFileSync(absolutePath, "utf8");
    var buffer = Buffer.from(toDecrypt, "base64");
    const decrypted = crypto.privateDecrypt(
        {
            key: privateKey.toString(),
        },
        buffer,
    )
    return decrypted.toString("utf8");
};

const { writeFileSync } = require('fs')

async function generateKeys() {
    const _assymetricKeysInPem = await require('./generateKeypairFromSeed.js')(seedphrase);

    writeFileSync('private.pem', _assymetricKeysInPem.privateKey)
    writeFileSync('public.pem', _assymetricKeysInPem.publicKey)
}

(async () => {
    await generateKeys();

    let digest = encryptStringWithRsaPublicKey({
        "A": "Apple",
        "B": "Banana"
    }, "public.pem");
    
    let actualData = decryptStringWithRsaPrivateKey(digest, "private.pem");
    console.log(b)
})()