Start with the JSON shape
CSV works best when the JSON contains an array of similar objects. Each object can become a row and each field can become a column. Nested objects may need flattened names such as user.name or address.city.
Things to review
- Whether all rows have the same fields.
- How nested arrays should be represented.
- Whether commas, quotes, and line breaks are escaped correctly.
- Whether numbers, dates, and IDs should stay as text.
Common mistakes
Opening CSV in spreadsheet software can change leading zeros, long IDs, and date-like values. Review the output before using it for imports or shared reporting.
FAQ
Can every JSON file become clean CSV?
No. Deeply nested or irregular JSON may need manual shaping first.
Does conversion prove the data is correct?
No. It only changes format. Business meaning and data quality still need review.