How To Convert Json To Csv
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The happy-path conversion
JSON that’s already tabular (array of flat objects) maps 1:1 to CSV:
Nested data — flatten or spread
Becomes:
Schema variance — when rows have different keys
Header row uses object keys. Column order is either insertion order or alphabetical (choose explicitly — don’t let your tool decide).
Quoting and escaping
Nested JSON doesn’t fit in flat CSV. Three common strategies:
Delimiter wars
If JSON objects don’t all share the same keys, CSV forces a choice:
Encoding — UTF-8 with (or without) BOM
Union is usually what you want. Warn the user (or log) when rows have missing keys so they know data gaps exist.
Large files — stream, don’t load
CSV rules (per RFC 4180):
Excel’s opinions
Fields containing commas, newlines, or double quotes must be wrapped in double quotes.
CSV to JSON — the reverse
Newlines inside quoted fields are literal — parsers must handle multi-line rows.
When CSV is the wrong format
CSV is “comma-separated values” — except when it’s not.
Common mistakes
CSV files have no header declaring their encoding. You find out by trying.
Run the numbers
Loading a 500MB JSON file into memory to write CSV → OOM. Stream: