Free client-side tool vs server-side validator. No uploads, no accounts, no limits.
| Feature | JSON Formatter & Validator | JSONLint |
|---|---|---|
| Price | ✓ Free forever | ✓ Free |
| Privacy | ✓ 100% client-side — data never leaves your device | ✗ Data sent to lint.me server |
| Signup required | ✓ None — works immediately | ✓ None — works immediately |
| Validate JSON | ✓ Syntax check with line/column errors | ✓ Syntax validation |
| Format JSON | ✓ Pretty-print with 2/4 space or tab indent | ✗ No formatting capability |
| Minify JSON | ✓ One-click single-line output | ✗ Not available |
| Syntax highlighting | ✓ Color-coded keys, strings, numbers | ✗ Plain text output |
| Works offline | ✓ Yes — after first load | ✗ Requires internet |
| Copy to clipboard | ✓ One-click copy | ✗ Manual selection required |
| Data security | ✓ Your data stays on your device | ✗ Third-party server access to your data |
JSON data often contains API keys, tokens, personal information, or sensitive business data. When you paste into JSONLint's web UI, that data is sent to their server for validation. Our formatter runs entirely in your browser, so your data never leaves your device.
Use our formatter when you want to check JSON syntax, pretty-print it, or minify it without sending the data to a third-party server — including offline. Use JSONLint when you specifically want a server-side linter for a one-off check. If your JSON contains secrets, the client-side path is the safer default.