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Asked: 2026-06-16T01:03:41+00:00

I have a string that contains a hexadecimal encoding of a UTF-8 string. "666f6f6c

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I have a string that contains a hexadecimal encoding of a UTF-8 string.

"666f6f6c 6973686e 6573732c 20697420 77617320 74686520 65706f63 68206f66 2062656c 6965662c 20697420 77617320 74686520 65706f63 68206f66 20696e63 72656475 6c697479 2c206974 20776173 20746865 20736561 736f6e20 6f66204c 69676874 2c206974 20776173 20746865 2073656"

I need to convert it back to a regular string. How can I do it?

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1 Answer

  1. Editorial Team
    var s = "666f6f6c 6973686e 6573732c 20697420 77617320 74686520 65706f63 68206f66 2062656c 6965662c 20697420 77617320 74686520 65706f63 68206f66 20696e63 72656475 6c697479 2c206974 20776173 20746865 20736561 736f6e20 6f66204c 69676874 2c206974 20776173 20746865 2073656";
var r = decodeURIComponent(s.replace(/\s+/g, '').replace(/[0-9a-f]{2}/g, '%$&'));

    This solution actually handles UTF-8.

    The idea is to put a % in front of every pair of hex digits (thus creating a URL encoded string), then letting decodeURIComponent handle the details (in particular, it will correctly decode multi-byte UTF-8 characters).

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