The Pitfalls of String Length Limiting
2025-04-30
This post delves into the complexities of string length limiting. Different character encodings (UTF-8, UTF-16, Unicode code points, grapheme clusters) lead to varying length calculation methods, easily causing inconsistencies between frontend, backend, and database layers, resulting in bugs. The author suggests using Unicode code point counting with NFC normalization, although not perfect, as the best approach. The article also explores the advantages and disadvantages of grapheme cluster counting, UTF-8 byte counting, and UTF-16 code unit counting, and provides example code for a hybrid counting method.
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