CSV to JSON Converter

Paste your CSV data, get perfectly formatted & validated JSON instantly. Copy or download — no signup, no limits.

100% client-side · Your data never leaves your browser · Free forever
Delimiter:
Indent:
📄 CSV Input PASTE HERE
{ } JSON Output WAITING 
Converted JSON will appear here...

Click "Convert to JSON" after pasting your CSV data.

Features:
  ✓ Syntax highlighting
  ✓ Auto-validation
  ✓ Copy to clipboard
  ✓ Download as .json file
🔒
100% Client-Side — Your Data Never Leaves Your Browser

All conversion happens locally in your browser using JavaScript. No data is uploaded to any server. Nothing is stored, tracked, or logged. You can disconnect from the internet and this tool still works perfectly.

ZERO DATA COLLECTION

Frequently Asked Questions

How do I convert CSV to JSON?
Paste your CSV data into the input box on the left. The first row is automatically used as JSON keys (headers). Click "Convert to JSON" — each subsequent row becomes a JSON object. The output is instantly validated and syntax-highlighted.
Is my data safe?
Yes. This tool runs 100% in your browser using JavaScript. Your CSV data is never sent to any server. Nothing is stored, logged, or transmitted. You can verify by disconnecting from the internet — the tool still works.
What delimiters are supported?
Comma (,), semicolon (;), tab, and pipe (|). By default the tool auto-detects the delimiter by analyzing your first few rows. You can also manually select a specific delimiter from the options bar.
Does it handle quoted fields?
Yes. Fields enclosed in double quotes are parsed correctly, including fields that contain commas, newlines, or escaped quotes ("") inside them — following RFC 4180 CSV standard.
Can I convert large CSV files?
The tool handles thousands of rows efficiently since it runs in your browser. For extremely large files (50,000+ rows), conversion may take a moment. There's no hard limit — it depends on your device's available memory.
Does it parse numbers and booleans?
By default, yes. Values like "42", "3.14" become JSON numbers; "true"/"false" become JSON booleans; empty fields become null. You can toggle these options off in the settings bar if you want all values as strings.