Prepare API input
Convert spreadsheet exports into JSON records for testing, migration or scripting.
100% local · files never leave your browser
Convert tool
CSV to JSON Converter
Convert CSV rows to structured JSON in your browser while preserving headers, quoted commas and values.
✓ Free to use✓ No signup✓ Runs locally
73 bytes · local only
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Processed entirely in this tab
Your input and result are not sent to JSON Hearth or stored on a server.
When to use it
What CSV to JSON helps you do
CSV-to-JSON conversion uses the header row as object keys and turns each following row into a JSON record.
Inspect CSV structure
Confirm how headers and quoted fields will map before building an importer.
Create development fixtures
Turn a small table into JSON examples for local development and tests.
Important limitations
What to check before using the result
- CSV does not preserve rich data types reliably, so numeric and boolean-looking values may need review.
- Inconsistent row lengths or unusual dialects can require cleanup before conversion.
Common questions
About CSV to JSON
Does CSV preserve numbers and booleans?
CSV cells are text-oriented. Review inferred or converted values when precise types matter.
Can CSV fields contain commas?
Yes. Properly quoted fields can contain commas, line breaks and quotation marks.