CSV to JSON Converter
Convert CSV data into a JSON array of objects, right in your browser.
🔒 Processed locally in your browser
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How to use
- Paste your CSV data into the box above, or upload a .csv file.
- Leave "First row is headers" checked if your first row contains column names, or uncheck it to auto-generate column1, column2, ... keys.
- The JSON output updates automatically below as you type or upload.
- Use Copy to copy the JSON to your clipboard, or Download to save it as a .json file.
Features
- Converts CSV data into a clean JSON array of objects
- Hand-written RFC 4180 parser handles quoted fields, commas, escaped quotes, and embedded newlines
- Optional header row toggle — auto-generates column1, column2, ... keys when your CSV has none
- Clear error messages for malformed CSV instead of silent garbage
- 100% client-side — your data never leaves your browser
Frequently asked questions
Does my CSV get uploaded anywhere?
No. CSV to JSON runs entirely in your browser — your data is never sent to a server.
What if my CSV doesn't have a header row?
Uncheck "First row is headers" and the tool will generate column1, column2, ... keys automatically, sized to the widest row.
Does it handle fields with commas or quotes inside them?
Yes. Fields wrapped in double quotes can safely contain commas, newlines, and escaped "" quotes, per the RFC 4180 CSV standard.
What happens with malformed CSV, like an unterminated quote?
You'll see a clear error message instead of broken or silently incorrect output, so you can fix the source data.
Can I upload a CSV file instead of pasting it?
Yes. Use the upload control to load a .csv file directly, or simply paste CSV text into the textarea.