If you mean "why Parse, Don't Validate", you should read the original blog post, linked at the top of the article. It's… transformative, if you aren't already a

If you mean "why Parse, Don't Validate", you should read the original blog post, linked at the top of the article. It's… transformative, if you aren't already aware of the principle. https://lexi-lambda.github.io/blog/2019/11/05/parse-don-t-validate/ https://lexi-lambda.github.io/blog/2019/11/05/parse-don-t-va... If you mean "why this library", well, I guess parser combinators are nice! Some may say that a declarative statement of the parsing restrictions is better than a procedural implementation, on general principles.