Check if a file is binary or ASCII with Node.js?

Question

I\'m wondering what would be the best way to check if a file is binary or ASCII with Node.js?

There appears to be two ways not specific to node.js:

Answer 1

I came here from google but as I couldn't find a satisfactory answer, I took another approach which works for me:

const string_to_test = "I am just a piece of text";
//const binary_to_test = "��˰!1�H��1�1����!H�=u�!�";
if(/\ufffd/.test(string_to_test) === true){
    console.log("I'm 'binary'");
}else{
    console.log("I'm proper text");
}

How does it works? If you try to open binary data in a normal way (without using a hex editor), it will encounter some rendering problems which translate to you as a succession of this weird character � called "Replacement character".