CSV JSON Converter
Convert between CSV and JSON instantly in your browser. Paste CSV with a header row to get JSON, or paste JSON to get CSV.
Input
Auto-detects JSON objects or arrays and CSV with a header row. Limit: 1 MB.
Output
When to use CSV JSON Converter
Common ways to use CSV JSON Converter:
- Convert API JSON to CSV for spreadsheets
Turn JSON into CSV so you can open it in Excel, Numbers, or Google Sheets.
- Turn a CSV export into JSON for scripts
Convert CSV from tools or databases into JSON for code, automation, or tests.
- Normalize columns before importing
Quickly review fields and get a consistent structure before you import data elsewhere.
- Quickly inspect and reformat data
Paste data and get clean, formatted output for debugging or sharing.
- Prepare sample data for testing
Generate JSON or CSV examples for unit tests, demos, or mock data.
CSV JSON Converter FAQ
- How do I convert between CSV and JSON?
- Paste CSV with a header row or paste JSON as an object or an array of objects. The converter detects the format and updates the output automatically.
- What JSON shapes are supported for CSV output?
- The converter accepts a single JSON object or an array of JSON objects. When converting to CSV, keys across all objects are merged into one header row.
- Does this app store or send my data?
- No. Conversion stays in your browser. Clipboard actions run only when you use Paste or Copy, and shared AppDoesIt page features may still fetch locale files or remember site-level preferences.
- Why am I seeing an error?
- Common causes are invalid JSON, CSV without a header row, unbalanced CSV quotes, or input larger than 1 MB.
- Can I paste and copy from the converter?
- Yes. Use Paste to read from the clipboard when your browser allows it, and use Copy to place the converted output back on the clipboard.
Help & instructions
How to use
- Paste CSV (with a header row) or JSON (an object or an array of objects) into the Input panel.
- The Output updates automatically — JSON becomes CSV, and CSV becomes a JSON array of objects.
- Use Paste to pull text from your clipboard, Clear to reset the tool, and Copy to save the converted output.
Tips
- For CSV input, the first row is treated as column headers.
- For JSON → CSV, keys across all objects are merged into one header row.
- Quoted CSV values are supported, and nested JSON values are stringified into CSV text.
Troubleshooting
- Invalid JSON must be corrected so it is a single object or an array of objects.
- CSV input needs a header row and balanced quotes to convert cleanly.
- Inputs larger than 1 MB are rejected to keep the browser responsive.
Privacy and browser behavior
- Conversion happens locally in your browser; this tool does not upload your input to a server.
- Paste and Copy use your clipboard only when you click those buttons.
- AppDoesIt pages may also fetch shared locale files and remember site-level preferences such as theme, favorites, and cookie consent in this browser.