Microtool
JSONSanity
Valid JSON is not always sane.
Offline JSON Validator + Sanity Checker
Your JSON never leaves your machine. Runs entirely offline.
What it does
- Deterministic warnings (no AI / no guessing)
- Runs locally (ZIP, no backend)
- Stats: keys, objects, arrays, max depth
- Flags mixed array types, deep nesting, inconsistent keys, null-heavy fields
Why offline
- No accounts or tracking
- Your JSON never leaves your machine
- Download once, keep forever
How It Works
1. Paste JSON
Paste your JSON data into the validator
2. Validate + get stats
Get validation results and structural statistics
3. Fix issues until SANE
Address warnings until your JSON is structurally sound
FAQ
Does it upload my JSON?
No. JSONSanity runs entirely in your browser.
Is it AI-powered?
No. All warnings are deterministic rule-based checks.
Does it require installation?
No, just open index.html in your browser.
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