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Asked: 2026-06-10T00:02:49+00:00

I’m trying to port some code from Java to Node.js, and I’ve run into

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I’m trying to port some code from Java to Node.js, and I’ve run into a little trouble.

Given the String "645553dd" in Java, I can extract a series of bytes using .getBytes("ISO_8859_1") that looks like { 54, 52, 53, 53, 53, 51, 100, 100 }. However, I’m having a hard time doing the same in Node.js. I tried using buffers, converting to the similar ASCII charset, but no luck. I tried using node-iconv, but it kept throwing the error EILSEQ, Illegal character sequence. How can I get the same set of bytes in Node.js?

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1 Answer

  1. Editorial Team

    You should be able to convert from the Buffer’s default encoding of UTF-8 to ISO-8859-1 with iconv:

    var Iconv  = require('iconv').Iconv;
var ic8859 = new Iconv('UTF-8', 'ISO-8859-1');

console.log( ic8859.convert(new Buffer('645553dd')) );

    Note that the values are output in base-16 — 0x64 == 100:

    <SlowBuffer 36 34 35 35 35 33 64 64>

    If you’re still getting a EILSEQ error, then your strings contains a character code that isn’t supported by ISO-8859-1. You’ll either have to translate or ignore these characters:

    var ic8859 = new Iconv('UTF-8', 'ISO-8859-1//IGNORE');

    Or try a different encoding, like UTF-8:

    console.log(new Buffer('645553dd'));
// <Buffer 36 34 35 35 35 33 64 64>
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