node.js - Javascript unicode to ASCII -

need convert unicode of soh value '\u0001' ascii. why not working?

var soh = string.fromcharcode(01);
returns '\u0001'
or when try

var soh = '\u0001' returns smiley face.
how can unicode become proper soh value(a blank unprintable character)

js has no ascii strings, they're intrinsically utf-16.

in browser you're out of luck. if you're coding node.js you're lucky!

you can use buffer transcode strings octets , manipulate binary data @ will. won't valid string out of buffer once you've messed it.

either way you'll have read more here:

or here:

edit: in comment use node.js, excerpt second link above.

const buf5 = buffer.from('test'); // creates buffer containing ascii bytes [74, 65, 73, 74].

to create soh character embedded in common ascii string use common escape sequence\x01 so:

const bufferwithsoh = buffer.from("string \x01 soh", "ascii");

this should it. can send bufferwithsoh content output stream such network, console or file stream.

node.js documentation guide on how use strings in buffer pretty well, second link above.

Perl