Web Reference: Nov 5, 2019 · Don’t be afraid to parse data in multiple passes. Avoiding shotgun parsing just means you shouldn’t act on the input data before it’s fully parsed, not that you can’t use some of the input data to decide how to parse other input data. Plenty of useful parsers are context-sensitive. Alexis King describes this eloquently in her original 2019 blog post, Parse, don’t validate. Mark Seemann references it in his book, Software That Fits in Your Head. Validation is a point-in-time method that typically returns true or false (and if false a list of reasons why it’s false). Jul 23, 2025 · One of the most important consequences of the “Parse, don’t validate” principle is that it forces you to fail early. When you only validate, you can still debate whether you should put a return or a raise right there or not.
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