How to convert hex numbers to byte string?

Question

> str = '\xae\xee'
'®î'

How to convert [0xae, 0xee] to '®î'?

hope this link help for you gist.github.com/tauzen/3d18825ae41ff3fc8981 — Praveen Gehlot
– Praveen Gehlot, Commented Dec 2, 2019 at 7:32
sorry, not tested String.fromCharCode, I thought it can only handle numbers less than 128 — thinker3
– thinker3, Commented Dec 2, 2019 at 7:33
actually I tested String.fromCharCode(128), it is ' ', gave me that wrong expectation — thinker3
– thinker3, Commented Dec 2, 2019 at 7:39

Nick Parsons · Accepted Answer · 2019-12-05 03:59:01Z

3

You can use String.fromCharCode() to convert the hex values to their string representation with .map() and .join() to form a string:

const hex = [0xae, 0xee];
const res = hex.map(s => String.fromCharCode(s)).join('');
console.log(res);

edited Dec 5, 2019 at 3:59

answered Dec 2, 2019 at 7:26

Nick Parsons

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6 Comments

Nick Parsons Over a year ago

@georg ah nice, very clean

thinker3 Over a year ago

strange, '®\u0000\u0000î\u0001\u0000'

Nick Parsons Over a year ago

@thinker with what input?

thinker3 Over a year ago

> [0xae, 0xee].map(String.fromCharCode).join(''); '®\u0000\u0000î\u0001\u0000'

Nick Parsons Over a year ago

@thinker3 the reason why .map() isn't working here is because .map() will pass through the index as the second argument for String.fromCharCode(). We need to explicitly call it (.map(x => String.fromCharCode(x))) - I've updated my code

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