How do I convert CSV to JSON online?

Paste CSV in the input, ensure the correct delimiter is selected, enable header row if applicable, and copy the JSON array output. Each row becomes a JSON object keyed by column headers.

Can I convert JSON back to CSV?

Yes. Switch to JSON → CSV mode and paste a JSON array of objects. Column headers are derived from object keys and rows are exported as CSV.

Which delimiters are supported?

Comma, semicolon, tab, and pipe. The tool auto-detects the delimiter from the first line, or you can select manually.

Are quoted CSV fields supported?

Yes. Fields wrapped in double quotes, including commas and escaped quotes inside values, are parsed correctly.

Is my spreadsheet data uploaded?

No. Conversion runs entirely in your browser. CSV and JSON never leave your device.

Developers

CSV to JSON Converter

Convert CSV to JSON and JSON to CSV online — auto-detect delimiters, header rows, and copy output instantly.

100% client-side — your data never leaves this tab

CSV input

First row is header

JSON output

Paste CSV or JSON to convert between formats.

Loading tool…

What is CSV to JSON Converter?

CSV to JSON Converter transforms spreadsheet data into JSON arrays online — and converts JSON back to CSV for exports. Auto-detect comma, semicolon, tab, or pipe delimiters; treat the first row as headers; and copy pretty-printed JSON for APIs, databases, and JavaScript apps. Bidirectional conversion with no upload — ideal for data migration, test fixtures, and quick ETL prototyping.

CSV and JSON conversion happen entirely in-browser; data is never uploaded.

How to use CSV to JSON Converter

1Choose CSV → JSON or JSON → CSV with the mode toggle.
2Paste your data in the input editor.
3For CSV input, select delimiter and whether the first row is a header.
4Copy the converted output or load Sample data to try the tool.

Examples

CSV with headers

Outputs [{"name":"Alice","email":"...","score":"92"}, ...]

name,email,score
Alice,alice@example.com,92
Bob,bob@example.com,87

JSON to CSV

Produces a header row plus one CSV row per object.

[{"product":"Widget","price":19.99},{"product":"Gadget","price":29.99}]

Tips & common mistakes

Enable First row is header for typical spreadsheet exports with column names.
Try Tab delimiter for TSV files from Excel or Google Sheets paste.
Quoted fields with commas inside are handled correctly (RFC 4180-style parsing).
For large files, browser memory limits apply — split very large datasets if needed.

Who uses this tool?

Developers converting CSV exports to JSON for REST API test payloads.
Data analysts preparing spreadsheet data for JavaScript charting libraries.
Students converting lab result tables into JSON for programming assignments.
QA engineers building CSV/JSON test fixtures for import/export features.

Frequently asked questions

How do I convert CSV to JSON online?: Paste CSV in the input, ensure the correct delimiter is selected, enable header row if applicable, and copy the JSON array output. Each row becomes a JSON object keyed by column headers.
Can I convert JSON back to CSV?: Yes. Switch to JSON → CSV mode and paste a JSON array of objects. Column headers are derived from object keys and rows are exported as CSV.
Which delimiters are supported?: Comma, semicolon, tab, and pipe. The tool auto-detects the delimiter from the first line, or you can select manually.
Are quoted CSV fields supported?: Yes. Fields wrapped in double quotes, including commas and escaped quotes inside values, are parsed correctly.
Is my spreadsheet data uploaded?: No. Conversion runs entirely in your browser. CSV and JSON never leave your device.