uDSV.js – A faster CSV parser
Hey folks! I know CSV parsers (especially in JS) aren't terribly exciting and someone writes a "better" one every week. I'm in the middle of my parental leave, and this was a project that came out of me looking for the fastest/smallest CSV parser. It all started so innocently, and then turned into a benchmark-validation-athon; the library itself took ~2 weeks to write, but the performance comparisons took another ~4 weeks (on and off). The benchmarks were a huge effort, but I think they are the most thorough to date, both in breadth and in depth, so hopefully you find them useful:…
In plain words
uDSV.js is a JavaScript CSV parser designed for speed and small file size. It parses comma-separated values from text data and is intended for developers who need efficient CSV processing in their applications. The library distinguishes itself through extensive performance benchmarks comparing it against other parsers, with comprehensive testing across various use cases and data scenarios.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
Hey folks! I know CSV parsers (especially in JS) aren't terribly exciting and someone writes a "better" one every week. I'm in the middle of my parental leave, and this was a project that came out of me looking for the fastest/smallest CSV parser. It all started so innocently, and then turned into a benchmark-validation-athon; the library itself took ~2 weeks to write, but the performance comparisons took another ~4 weeks (on and off). The benchmarks were a huge effort, but I think they are the most thorough to date, both in breadth and in depth, so hopefully you find them useful: https://github.com/leeoniya/uDSV/tree/main/bench Let me know if you have specific concerns / questions / improvements :) cheers! Leon
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