CSV to JSON Converter

What is CSV to JSON Converter?

CSV is the standard for spreadsheet exports and database dumps, but modern web development runs on JSON. This converter turns your CSV into structured JSON, automatically mapping headers to object keys. Everything runs in your browser — suitable for sensitive data. Great for database imports, API debugging, or processing Excel exports. Supports custom delimiters, quote characters, and fields containing commas.

▶Use Cases5 scenarios
  • ◆Converting Excel exports into API data
  • ◆Importing CSV data into web applications
  • ◆Transforming database dumps to JSON
  • ◆Processing user lists and contact data
  • ◆Migrating between data formats
▶How to Use4 steps
  1. 1Paste or upload your CSV data
  2. 2Headers and delimiters auto-detected
  3. 3Watch the JSON output appear instantly
  4. 4Hit copy to grab your JSON
▶Features8 features
  • ✓Free
  • ✓No account needed
  • ✓Auto header mapping
  • ✓Real-time conversion
  • ✓Custom delimiters
  • ✓One-click copy
  • ✓Runs in browser
  • ✓Nothing uploaded
▶FAQ7 questions
What is CSV to JSON Converter?

An online Convert CSV to JSON instantly. Automatic header mapping, real-time conversion, one-click copy. Supports multiple input formats with one-click copy or download. All operations run locally in your browser — no uploads.

Does the first row become JSON keys?

Yes. By default, the first CSV row (headers) becomes the object keys. So "name,age" in CSV generates {"name": "...", "age": "..."}.

Does it support tab-separated files?

Yes. The tool auto-detects common delimiters (comma, tab, semicolon, pipe) and lets you specify a custom one.

What if a field contains commas?

The tool supports standard CSV quoting. If a field is wrapped in double quotes (like "Smith, John"), the comma is treated as content, not a delimiter.

Are numbers converted to number types?

Yes. The tool auto-detects numeric fields and converts them to JSON numbers (not strings). So "age": "25" becomes "age": 25.

Is my data uploaded anywhere?

No. All conversion happens locally in your browser. Your CSV never leaves your device.

How large a CSV can I use?

Since it runs in your browser, files up to 10 MB (around 100k rows) work smoothly. Larger files may need to be split.