> For the complete documentation index, see [llms.txt](https://www.csvpath.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://www.csvpath.org/getting-started/more-csv-and-excel-validation.md). # More CSV and Excel Validation CsvPath Framework includes a robust delimited data validation framework that makes validating CSV, Excel, JSONL, data frames, and other tabular formats a snap. The CsvPath Validation Language: * Is declarative * Provides powerful rules-based validation * Provides schema-based validation * Has over 200 validation functions and allows user-defined custom functions * Supports data upgrading and canonicalization * Streams data to handle large files * Provides metadata, variables, reporting, and error handling options * Comes with a wealth of features enabling all kinds of use cases Best of all, you can start small, do simple things incredibly quickly, and not worry that you'll hit a wall when the requirements get harder. Read on for a small example. Then look through the site for lots more examples, large and small. If you need help or have questions, [just ask](/getting-started/a-helping-hand.md)! --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://www.csvpath.org/getting-started/more-csv-and-excel-validation.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.