How to get the string length in bytes in nodejs?

Question

How to get the string length in bytes in nodejs? If I have a string, like this: äáöü then str.length will return with 4. But how to get that, how many bytes form the string?

Thanks in advance

A string does not *have* a length in bytes. This depends on the encoding used. — usr, Mar 25 '12 at 22:38

score 147 · Accepted Answer · edited Mar 14 '22 at 15:37

147

Here is an example:

str = 'äáöü';

console.log(str + ": " + str.length + " characters, " +
  Buffer.byteLength(str, 'utf8') + " bytes");

// äáöü: 4 characters, 8 bytes

Buffer.byteLength(string, [encoding])

edited Mar 14 '22 at 15:37

noraj

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answered Mar 25 '12 at 22:45

stewe

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Is there a way to automatically get KB, MB, as appropriate etc (human readable size) – chovy Sep 11 '13 at 20:56
4

chovy, `npm install filesize` – SGr Apr 24 '14 at 15:37

score 10 · Answer 2 · answered Jun 26 '15 at 23:50

10

function getBytes(string){
  return Buffer.byteLength(string, 'utf8')
}

answered Jun 26 '15 at 23:50

Anthony

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This is just a copy of the accepted answer, put into a function. – JohnnyHK Jun 27 '15 at 22:31
1

Buffer.byteLength is already a such function, and example above at least shows it's usage. With the same luck you could do `var byteLength = Buffer.byteLength` and it would also work just the same. – RReverser Oct 22 '15 at 18:27
1

The simplest and best answer – Intervalia Oct 04 '20 at 00:48

sad comrade · Answer 3 · 2019-11-16T19:33:21.940

2

Alternatively, you can use TextEncoder

new TextEncoder().encode(str).length

How to get the string length in bytes in nodejs?

4 Answers4

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