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JSON to CSV Converter

Local processing
Convert JSON arrays to CSV with custom delimiters and flatten options
Delimiter:
Comma ,
Headers
Flatten nested
JSON Input
CSV Output

Excel XLSX conversion

Read sheets locally or create an XLSX workbook from JSON. Supports up to 8 MiB compressed, 32 MiB expanded, 30 sheets and 100,000 cells. Formulas are never executed.

Create a workbook

Quote JSON numbers that need more than 15 significant digits, negative zero or unsupported magnitudes. They export as exact text instead of numeric cells.

Uses the JSON input from the converter above. Nested objects become JSON text cells.

Dates import as UTC ISO strings. Exports keep ISO strings as text. Formatted cells, merged layout, formulas and chart presentation do not round-trip. Text beginning with = is written as text.