(Node.js) Convert any File to Base64 (and back)

Demonstrates how to get the contents of any file as a base64 string, and then write it back.

Install Chilkat for Node.js and Electron using npm at Chilkat npm packages for Node.js Chilkat npm packages for Electron on Windows, Linux, MacOS

var os = require('os');
if (os.platform() == 'win32') {  
  var chilkat = require('@chilkat/ck-node23-win64'); 
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('@chilkat/ck-node23-linux-arm');
    } else if (os.arch() == 'arm64') {
        var chilkat = require('@chilkat/ck-node23-linux-arm64');
    } else {
        var chilkat = require('@chilkat/ck-node23-linux-x64');
    }
} else if (os.platform() == 'darwin') {
  var chilkat = require('@chilkat/ck-node23-mac-universal');
}

function chilkatExample() {

    var bd = new chilkat.BinData();

    // This example will load a PDF and return it as a base64 string.
    var success = bd.LoadFile("qa_data/pdf/helloWorld.pdf");
    if (success !== true) {
        console.log("Failed to load file.");
        return;
    }

    var b64Str = bd.GetEncoded("base64");
    console.log(b64Str);

    // Now write the base64 string back to the binary PDF file:
    var bd2 = new chilkat.BinData();
    success = bd2.AppendEncoded(b64Str,"base64");
    success = bd2.WriteFile("qa_output/helloWorld.pdf");

}

chilkatExample();