Node.js

Convert a File's Character Encoding from UTF-8 to UFT-8-BOM

See more HTML-to-XML/Text Examples

To add a utf-8 BOM to a file is just a matter of prepending these 3 bytes to the file: 0xEF 0xBB 0xBF.

This may be difficult in some programming languages, or it may be trivial in either. Therefore, the Chilkat solution you see here might be helpful, or in a language such as C++, the Chilkat solution isn't really necessary because it's easy to do yourself.

Node.js

NODEJS_PRELUDE

function chilkatExample() {

    var success = false;

    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    var charset = new chilkat.Charset();

    charset.FromCharset = "utf-8";
    charset.ToCharset = "bom-utf-8";

    success = charset.ConvertFile("qa_data/txt/helloWorld.txt","qa_output/helloWorldBom.txt");
    if (success !== true) {
        console.log(charset.LastErrorText);
        return;
    }

    console.log("Success.");

}

chilkatExample();