JSON Formatter & Validator

Paste messy JSON, get clean formatted output. Instant validation, syntax highlighting, one-click copy.








Ready — paste JSON to begin
Characters: 0 | Lines: 0










⚡ Instant


Client-side processing. No server calls, no waiting.






🔒 Private


Your JSON never leaves your browser. 100% local.






🎨 Syntax Colors


Keys, strings, numbers, booleans color-coded.






📏 Line Numbers


Easy error location with line references.






✅ Error Detection


Exact error position with line and column info.






📋 One-Click Copy


Copy formatted output instantly to clipboard.