Paste a JSON array of objects and download clean CSV — properly escapes commas, quotes and newlines inside values.
This tool runs entirely in your browser — no data is sent to our servers. If JavaScript is disabled, the fully interactive version will not run; enable JavaScript to compute results.
CSV exports are everywhere but most online converters miss the basics: quoting strings that contain commas, escaping double quotes inside fields, and using a stable column order across rows. The result is broken downloads that open badly in Excel.
This converter handles the standard cases correctly. Input must be a JSON array of objects — the converter takes the union of all keys across all objects as the column order, then writes each row with proper quoting. Strings containing commas or quotes are wrapped in double quotes; internal quotes are escaped by doubling them. The result opens cleanly in Excel, Google Sheets and any CSV-aware tool.
For nested objects or arrays inside object values, the converter stringifies them — which is rarely what you want. If your JSON has nesting, flatten it first (e.g., use object keys like address_street, address_city instead of address.street) before converting.
Usually because of character encoding (Excel sometimes assumes Windows-1252 instead of UTF-8) or because nested data was stringified into a single cell. The calculator outputs UTF-8, which Excel handles correctly.
They get JSON-stringified into a single CSV cell. For useful nested-to-tabular conversion, flatten the structure in your source JSON first.
No hard limit, but the browser does the conversion in memory. Tens of thousands of rows work fine; millions may be slow or run out of memory.
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