CSV JSON Converter
Convert CSV to JSON or JSON to CSV in your browser with Papa Parse—auto delimiter detection, header row option, table preview, and download.
Table preview
Result
Tips
Auto delimiter
Leave delimiter on Auto detect for comma, semicolon, tab, or pipe separated files.
Header row
When converting CSV to JSON, enable First row is header to produce an array of objects instead of arrays.
JSON to CSV input
JSON input should be an array of objects or an array of arrays for CSV export.
Large files
Very large pasted content may slow the browser or hit memory limits.
Bidirectional conversion
Switch between CSV→JSON and JSON→CSV with one tool.
Papa Parse powered
Parsing and unparsing use Papa Parse loaded from CDN in your browser.
Table preview
After CSV→JSON conversion, preview the first rows in a table.
What this tool does
CSV JSON Converter transforms tabular CSV text into JSON and converts JSON arrays back into CSV.
It runs client-side with Papa Parse—ideal for quick data shape changes without a spreadsheet or server upload.
How to use
Choose direction
Select CSV→JSON or JSON→CSV.
Paste input
Add CSV or JSON text. For CSV, set delimiter and header options if needed.
Convert and export
Run Convert, preview the table when available, then copy or download the output.
Processing and privacy
All parsing and conversion happen in your browser via Papa Parse from CDN.
No CSV or JSON content is posted to Toolomix servers for this tool.
Limitations
Known limits
- Pasted text only—no multi-file batch workflow
- Very large inputs may exceed browser memory
- Malformed CSV or JSON is rejected with an error
- Preview shows at most the first 100 rows
Frequently Asked Questions
Does this tool upload my data?
No. Conversion runs entirely in your browser with Papa Parse. Your CSV or JSON is not sent to Toolomix.
How does delimiter auto-detect work?
Papa Parse inspects the pasted text and guesses the most likely delimiter. You can override it manually if the guess is wrong.
What JSON shape do I get from CSV?
With headers enabled, you get an array of objects keyed by column names. Without headers, you get an array of row arrays.
What JSON do I need for CSV export?
Provide a JSON array. Each item should be an object (keys become columns) or an array (columns in order).
Can I download the result?
Yes. Use Download to save converted.json or converted.csv after conversion.
Why does my CSV fail to parse?
Check for inconsistent column counts, unescaped quotes, or the wrong delimiter. Try a different delimiter setting.
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Try it now
Paste data, pick a direction, and convert locally without uploading.
