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I've created a simple buffer, and I've put into it my string "Héllo"

Here's my code:

var str = "Héllo";
var buff = new Buffer(str.length);
buff.write(str);

console.log(buff.toString("utf8"));

however, it returns "Héll" and not Héllo, why?

How can I fix that?

Michel Ange
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2 Answers2

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UTF-8 characters can have different length - from 1 byte to 4 bytes - look at this answer https://stackoverflow.com/a/9533324/4486609

So, it is not ok to assume that it have 2 bytes, as you did.

As for the right length, look at this https://stackoverflow.com/a/9864762/4486609

Community
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Artem Dudkin
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.length is reporting the number of chars, not the number of bytes. But new Buffer() is expecting the number of bytes. The 'é' requires two bytes. So the last char is falling off the end of the buffer and being truncated.

If you don't need to support anything older than Node.js 4.x.x, you can use Buffer.from():

let buffer = Buffer.from('Héllo');
console.log(buffer.toString()); // 'Héllo'
Trott
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  • and if my string is dynamic? – Michel Ange Dec 14 '16 at 19:02
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    Might be my ignorance, but I'm not sure I understand what you mean by "dynamic". You can pass a variable in like `Buffer.from(myString)` if that will suffice. – Trott Dec 14 '16 at 19:06
  • ah sorry i didn't see your edit, and how can I do the same with new Buffer(int) ? I need this method because I've to add other things after, and I want to add them to the length – Michel Ange Dec 14 '16 at 19:30