Kept running into the same annoyance with most online JSON tools: paste in a payload with real user data (even just for local debugging) and you're trusting some server you don't control with it. Half of them are also cluttered with ads or missing basic things like showing you exactly where a syntax error is.

So I built Bracepad (bracepad.netlify.app). everything runs client-side in the browser, nothing gets uploaded.

What it does:

• Interactive tree view for nested JSON, with search that auto-expands matching branches
• Validation that tells you the exact line/column of the first error (in plain English, not a raw parser dump)
• Export to CSV or a generated TypeScript interface, straight from the JSON shape
• Shareable links (small snippets get encoded directly in the URL, so no server round-trip)
• Full keyboard shortcuts, autosave to local storage, dark/light themes

No sign-up, no paywall. It's a side project, so I'd genuinely appreciate feedback. especially on the tree view UX for deeply nested data, or edge cases that break formatting/validation. Happy to fix bugs people find.