IDNA / Punycode converter
lazarus / 38-Networking and Web Programming

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Renat.Su · 2025-06-10 18:48

A new repository is now available for working with Internationalized
Domain Names (IDN) in FreePascal:
🔗 https://github.com/Al-Muhandis/fp-idn/

The repo implements Punycode encoding/decoding, fully RFC
3492-compliant. While it’s designed for domain names in Unicode, it
can also be used in any context where you need to safely convert
Unicode strings into ASCII — such as storing or transmitting
identifiers in URLs or file names.
Code: [Select]writeln(PunycodeEncode('пример')); // -> e1afmkfd
writeln(UnicodeToIDN('mail.пример.рф')); // ->  mail.xn--e1afmkfd.xn--
p1ai
Includes unit tests and performance benchmarks.

Feedback, bug reports, and contributions are very welcome!

P.S. It also supports four-byte code points, unlike other
implementations (that is, it covers the entire space, including
emojis, for example)