Encoding of strings in JavaScript can either be done in UTF-16 or UTF-8

While browsing through the MDN documentation on charAt, I came across a question about the UTF-16 encoding of strings in JavaScript.

To test my understanding, I decided to run this script in NodeJS:

Buffer.from("€").length // returns 3

I was puzzled by the result showing 3 bytes. Typically, I would expect either 2 or 4 bytes for UTF-16 strings. How is it possible for a UTF-16 string to be 3 bytes long?

Although I searched various questions on StackOverflow, I couldn't find a satisfactory explanation for this particular issue.

javascriptstring

Answer №1

When you are creating a Buffer from a string, specifying an encoding is necessary. If none is provided, it will default to UTF-8.

If you are specifically looking for the byte length in UTF-16LE encoding, you can use:

Buffer.from("€", "utf16le").length

Alternatively, you can simply calculate the byte length by multiplying the character length by 2:

"€".length * 2

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