JSON Formatter & Validator

Aug 25, 2026

First release.
• Format and minify with 2 spaces, 4 spaces or tabs
• Validation that names the line and column, and jumps you there
• Finds duplicate keys — the ones other readers drop silently
• Reads JSON with comments, trailing commas and unquoted keys, and tells you what it fixed
• Collapsible tree view with copyable paths
• Big integers, exponents and trailing zeros are never rewritten
• Light and dark, 10 languages, everything on device