JSON / CSV Formatter

Pretty-print or minify JSON with validation, and convert CSV ↔ JSON both ways — all client-side, so confidential data never leaves your machine.

Paste JSON or CSV

Output

Everything runs in your browser — nothing is uploaded, safe for confidential data.
CSV → JSON expects a header row and handles quoted fields with commas. JSON → CSV expects an array of flat objects.
Validation errors point to the position where parsing failed.