If your goal is to have

str = "HellonWorld";

and output what it contains in string literal form, you can use JSON.stringify:

console.log(JSON.stringify(str)); // ""HellonWorld""

const str = HellonWorld;

const json = JSON.stringify(str);

console.log(json); // HellonWorld

for (let i = 0; i < json.length; ++i) {

    console.log(`${i}: ${json.charAt(i)} (0x${json.charCodeAt(i).toString(16).toUpperCase().padStart(4, 0)})`);

}

.as-console-wrapper {

    max-height: 100% !important;

}

console.log adds the outer quotes (at least in Chrome's implementation), but the content within them is a string literal (yes, that's somewhat confusing).

JSON.stringify takes what you give it (in this case, a string) and returns a string containing valid JSON for that value. So for the above, it returns an opening quote ("), the word Hello, a backslash (), the letter n, the word World, and the closing quote ("). The linefeed in the string is escaped in the output as a and an n because that's how you encode a linefeed in JSON. Other escape sequences are similarly encoded.