Convert CSV to JSON

Someone handed you a CSV export from a spreadsheet or a legacy system, but your application, API or data store speaks JSON. Convert CSV to JSON turns each table row into a JSON object, using the header row as the keys, and returns a clean, readable array you can paste straight into code, fixtures or a database import.

Quoted fields, embedded delimiters and multiline cells are handled correctly, and an optional type detection converts numbers, booleans and null from their string representations into native JSON values. Choose your delimiter, decide whether the first row is a header, and the JSON is generated locally in your browser — nothing is uploaded.

• Rows become objects: the header row supplies the keys for every record.
• Full CSV parsing: quoted fields with embedded delimiters, quotes and newlines are handled correctly.
• Delimiter choice: comma, tab or semicolon for CSV, TSV and European formats.
• Header toggle: use the first row as names, or generate col1, col2 keys.
• Type detection: auto-convert numbers, booleans and null (toggleable).
• Duplicate-safe keys: repeated column names are suffixed so no key is lost.
• Copy or download: grab the JSON or save it as a .json file.
• Private by design: all processing happens locally in your browser.

1. Paste your CSV or TSV or open a .csv file.
2. Choose the delimiter to match your file.
3. Confirm the header option and whether to auto-detect types.
4. Copy or download the JSON array of objects.

Example 1 — Data import. A spreadsheet export needs to become JSON for your application. Convert it, paste the array into a fixture, and you are done.

Example 2 — API request bodies. Someone maintains records in Excel. Convert the sheet to JSON objects that your endpoint accepts directly.

Example 3 — Migration. Legacy systems export CSV. Turn each row into a JSON record for the new data store, with types intact via auto-detection.

• Instant JSON — tables become arrays of objects in one click.
• Correct parsing — quoted and multiline fields survive intact.
• Clean types — numbers and booleans are detected, not stringified.
• Format-flexible — comma, tab or semicolon input.
• Free and private — runs locally, no uploads.