Data dictionary generator
Turn CSV headers and observed values into an editable field catalogue with descriptions.
The dictionary contains observed types, empty counts, distinct counts and optional descriptions. It excludes raw example values. Inference cannot recover undocumented business meanings. Up to 1,000,000 characters, 10,000 data records, 100 columns and 100,000 cells across the sources. Files for multi-source tools are limited to 4,000,000 bytes total. Reports retain at most 500 diagnostic findings and state any omitted count. CSV and JSON outputs are limited to 4,000,000 characters. Paste CSV data with unique column headers. Quoted multiline cells are supported. Results update as you type. Up to 1,000,000 characters.
Your result
How to use Data dictionary generator
- Paste a representative CSV export.
- Add descriptions as a JSON object keyed by the exact column names.
- Download the field dictionary as CSV and edit it in your spreadsheet.
Useful next steps
Prepare the source
Paste a representative CSV export.
Choose the matching rules
Add descriptions as a JSON object keyed by the exact column names.
Review and keep the result
Download the field dictionary as CSV and edit it in your spreadsheet. The dictionary contains observed types, empty counts, distinct counts and optional descriptions. It excludes raw example values. Inference cannot recover undocumented business meanings.