Convert JSON objects into CSV, semicolon-separated text or TSV locally. Preview rows, preserve number spellings and choose spreadsheet formula protection before downloading.
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First 30 data rows and 10 columns. Copy and download contain the full result.
Your JSON stays on your device. Conversion uses local scripts with no uploads, accounts, dependencies or input storage. A shared strict JSON checker prevents inconsistent syntax handling, while original number spellings stay intact instead of rounding through JavaScript Number values.
Use an array containing only objects, or one object for a single data row. Primitive arrays, mixed arrays and top-level primitives are rejected. Columns are the union of top-level property names in first-seen source order, including keys found in later rows. An empty array or records with no columns give an error. Duplicate keys anywhere in the input are rejected rather than choosing a value silently.
Nested objects and arrays become compact JSON text in one cell; they are not flattened or expanded into rows. Null, absent properties and empty strings produce blank cells, so those distinctions are lost in CSV. Booleans become true or false. Strings are JSON-decoded, while number tokens keep their exact spelling. CSV carries no data types; importing software may reinterpret large numbers, dates or empty cells.
Every field, including the header, is double-quoted; internal double quotes are doubled. Records use CRLF with a final record terminator, and embedded cell line breaks remain within quotes. The delimiter can be comma, semicolon or tab. Download uses UTF-8; an optional BOM affects downloads only, not the displayed output or Copy. Tab selection downloads a .tsv file; the others use .csv.
When enabled, formula-like string cells and headers receive a leading apostrophe before CSV quoting. The heuristic detects ASCII or fullwidth equals, plus, minus or at-sign after leading whitespace/control characters, and text starting with TAB, CR or LF. This changes actual field text and is not a guarantee across spreadsheet programs or re-saving. Validated JSON number tokens are not prefixed, including negative numbers. For untrusted data, import columns explicitly as text. Turn protection off when exact string values are required for a trusted programmatic workflow.
The shared JSON checker accepts up to 200,000 UTF-16 input units, 50,000 tokens and 100 container levels. Conversion accepts 5,000 data rows, 200 columns and 100,000 data cells. Output is limited to 2,000,000 UTF-16 units. Limits return an error without partial exports. Decoded strings or headers with unpaired surrogate units are rejected to avoid silent UTF-8 replacement.
Preview is limited to the first 30 data rows and 10 columns. Copy and download contain the complete result. Cells are rendered as plain text and never executed. Nothing is uploaded or saved in browser storage. Clear preserves options; Try an example restores defaults. Input and option edits clear the old output.
