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CSV Column Type Inspector
Inspect every CSV cell and download complete lexical type counts and evidence rows for each column.
Pasted CSV, One UTF-8 CSV file
column-types.json
Browser only
Runs locally in your browser. Your files, pasted content and generated output are not uploaded. Reset clears this tool’s working data.
This tool needs JavaScript. If it does not load, refresh the page and try again.
How to use this tool
- Enter the admitted input and explicit options described below.
- Select Inspect column types and inspect the stated conventions.
- Download the complete result and any companion report.
Examples
001 stays a string; 1e3 is a lexical decimal token; 2000-02-29 is a real ISO date.
Limitations
- At most 1 MiB UTF-8, 10000 data rows, 100 columns, 100000 cells including headers and 10000 UTF-16 units per cell. At least one data row and unique nonempty headers; 20 MiB output and 30 seconds.
- Exact lowercase true/false, strict JSON number spellings and real ISO dates only. No sampling, trimming, locale guessing, confidence score or value conversion.
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