CSV JSON Converter
Convert between CSV and JSON data formats. Free, fast, and works entirely in your browser with no sign-up required.
Options
Input — CSV
CSV → JSON Features
- Auto-detects delimiter (comma, semicolon, tab, pipe)
- RFC 4180-compliant quoted field parsing
- Type inference: numbers, booleans, null
- Header row or indexed arrays
- Configurable JSON indentation (2, 4, 8 spaces)
- Inconsistent column count warnings
- Unclosed quote detection
JSON → CSV Features
- Array of objects with any key set
- Nested object flattening (dot notation)
- Arrays stored as JSON strings in cells
- Configurable output delimiter
- Proper cell escaping (commas, quotes, newlines)
- Optional header row generation
- Missing key graceful handling
Privacy First: All conversion happens entirely in your browser. Your data is never uploaded to any server.