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
- This converter infers numbers, true, false and null, including inside quoted cells. Numeric-looking identifiers can lose leading zeros or precision; use explicit column typing in your import pipeline when they must remain text.
- Inconsistent row lengths or unusual dialects can require cleanup before conversion.
Common questions
About CSV to JSON
Does CSV preserve numbers and booleans?
CSV has no type schema. This tool converts recognizable numeric, Boolean and null text automatically, so quoting 0012 does not keep it as a string. Review the output against your destination's column types.
Can CSV fields contain commas?
Yes. Properly quoted fields can contain commas, line breaks and quotation marks.