About FlatCSV

FlatCSV is a free, no-nonsense converter between JSON and CSV — two formats that developers, analysts and data teams juggle every single day.

We built it because most online converters impose artificial limits: row caps, forced sign-ups, watermarks, or silent uploads of your data. FlatCSV does the opposite — the entire converter runs in your browser, files are never uploaded, and there is nothing to register for.

Highlights

• Nested JSON objects flattened into dot-notation columns, with no data loss
• Bi-directional: JSON → CSV and CSV → JSON with automatic type inference
• Auto-detected delimiters (comma, semicolon, tab)
• No file size caps, no accounts, no watermarks

Get in touch

Feedback, bug reports or feature requests: YOUR-EMAIL@example.com