📤 Step 1 — Provide your JSON
💡 You can also drag & drop a .json file anywhere on this page
🔍 JSON Scanner
Free · Private · Instant — Your files never leave your device
💡 What does this scan detect?
- 🔎 Valid syntax — instantly verifies your file is real JSON, with the exact error if not.
- 👻 Hidden Unicode characters — invisible direction/zero-width marks that break parsers or disguise text (the same issue GitHub warns about).
- 🔁 Duplicate items — exact repeated entries sneaking into your arrays.
- 🔤 Case-conflicting keys — catches
namevsNamemistakes that silently break pages. - 🕳️ Missing fields — items lacking keys that their siblings have.
- ⬜ Empty values — fields set to
"",nullorundefined. - 📊 Structure overview — root type, item count, and full key list at a glance.
🛡️ Why this tool respects you
Blazing Fast
Instant local scanning — no server round-trip, no waiting.
Zero Tracking
No analytics, no fingerprints, no logging of any kind.
Zero Cookies
Nothing stored on your device. Ever.
No Data Leaves
Your file is analyzed entirely in your browser's memory.
Fully Accessible
Screen-reader friendly, keyboard navigable, high contrast.
Free Forever
A gift to visitors. No accounts, no paywalls, no tricks.
📬 Contact & Navigation
Questions or feedback?
good.sullen035@passinbox.com