JSONSanity

A tiny offline dev tool that validates JSON, computes structural stats, and flags deterministic “sanity” risks (mixed array types, deep nesting, inconsistent keys, null-heavy fields). No AI. No backend.

What you get

• index.html
• styles.css
• script.js
• README.txt

Key benefits (bullets)

• Offline-first: runs locally in your browser (no server, no data leaves your machine)
• Deterministic results: same JSON → same output (no AI, no guessing)
• Fast JSON triage: status pill (EMPTY / INVALID / SANE / ISSUES) + clear parse errors
• Instant insight: total keys, arrays, objects, and max depth
• Actionable warnings: consistent paths, deterministic ordering, severity levels (RISK / WARN / INFO)

How it works

1. Paste JSON into the left panel
2. JSONSanity validates it (or shows the exact parse error)
3. You get structural stats + deterministic warnings in the results panel
4. Copy/fix your JSON and re-check until it’s SANE