CSV ⇄ JSON Converter
Convert CSV and JSON with delimiter and header options.
Shortcuts: Ctrl/Cmd+Enter (Sample), Ctrl/Cmd+Shift+C (Copy), Ctrl/Cmd+S (Download)
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How to Use
- 1
Select conversion mode.
- 2
Paste CSV or JSON into the input field.
- 3
Adjust delimiter/header settings if needed.
Features
- ✓CSV to JSON and JSON to CSV
- ✓Custom delimiter support
- ✓Header on/off option
- ✓One-click output copy
FAQ
Q. Does it handle quoted CSV fields?
A. Yes, it supports basic quoted fields and escaped double quotes.
Q. What JSON format works best?
A. Array of objects (e.g., [{...}, {...}]) is recommended.
Technical Notes
CSV parsing uses a lightweight state-based parser for quoted values.
For JSON arrays, all keys are merged to build consistent CSV headers.
Security & Privacy
All data transformation happens locally in your browser.
No server logging or transmission of your input data.
Examples, Pre-Conversion Checks, and Common Mistakes
Examples
- Convert spreadsheet product lists into JSON sample data for development.
- Turn JSON arrays from APIs into CSV for review in spreadsheet software.
- Convert contact lists or event attendee data while keeping a clear column structure.
Cautions
- Confirm the first CSV row is the correct header before converting.
- Check cells that include commas, line breaks, or double quotes for correct escaping.
- Remove unnecessary columns before sharing data that includes personal information.
Common Mistakes
- Missing inconsistent header names and ending up with split JSON keys.
- Treating numeric IDs as numbers and losing leading zeros.
- Expecting deeply nested JSON to round-trip perfectly into a flat table.