CSV to JSON
This free online CSV to JSON converter turns spreadsheet exports, database dumps and API fixtures into a clean JSON array as you paste.
How to use
- Paste your CSV into the editor — the first row is used as the header.
- The JSON array appears instantly; each data row becomes one object with string values.
- Copy the JSON or download it as data.json.
Frequently asked questions
Are numbers converted to JSON numbers?
No. Type inference is intentionally off: every cell stays a string, so "007", "1.50" and "1e5" keep their exact spelling. Use the output as-is, or convert specific fields in your own code once you control the schema.
How are commas, quotes and line breaks inside a cell handled?
Standard CSV quoting rules apply: a field wrapped in double quotes may contain commas, escaped double quotes and raw line breaks, and the parser unpacks them correctly into the JSON value.
What happens if a row has missing or extra columns?
The conversion stops with an explicit error naming the row and the expected column count. Rows are never silently padded with empty values or truncated, so a broken export cannot turn into subtly wrong JSON.
Which row becomes the header?
Always the first row. Every following non-empty row becomes one JSON object keyed by the header. If two columns share a name, the later column wins for that key, matching ordinary object semantics.
Is my CSV uploaded anywhere?
No. Parsing happens entirely in your browser with JavaScript running on your device — nothing is uploaded, stored or logged, which makes the tool safe for customer data and internal exports.
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About this tool
This free online CSV to JSON converter turns spreadsheet exports, database dumps and API fixtures into a clean JSON array as you paste. The first row is treated as the header and becomes the object keys; every data row becomes one object. Values are deliberately kept as strings: no type guessing happens, so "007", "1.50" and "TRUE" survive exactly as written — a policy that matters for zip codes, phone numbers and IDs that would otherwise be silently mangled. Quoted fields, embedded commas, escaped quotes and multi-line cells are all handled by a battle-tested parser, and blank lines are skipped. The tool refuses to guess on broken input: a row with missing or extra columns is reported with its position instead of being padded quietly, and an unterminated quote fails loudly. Everything runs in your browser — the data you paste never leaves your device. The result appears as formatted JSON you can copy or download as data.json.