Service Introduction
JSON Shuttle is a browser-based JSON tool that validates, formats, repairs, and escapes JSON. All processing runs locally on your device—no data is sent to any server—so you get both speed and privacy.
Security & Privacy
Local Processing
All JSON is handled in your browser; your data never leaves your device.
No Data Upload
We don't send your content anywhere—no logging, no tracking.
Open & Transparent
Code is auditable; build and deploy are transparent; you can self-host.
Privacy First
No personal data collection, no accounts—use and leave.
Use Cases
Development and debugging, API integration, config validation, log formatting, teaching and demos, fixing common JSON syntax errors.
Meeting you for the first time feels like the return of an old friend
JSON Shuttle is free and maintained by one person. If it helps you, consider share with friends:
Contact
Email: [email protected]
Who is JSON Shuttle for?
- Backend developers debugging API responses
- Frontend developers handling configuration files
- Data engineers cleaning up JSON exports
- Anyone learning JSON syntax
When should I use JSON Shuttle?
- Your API returns 'unexpected token' but you can't tell which key is broken
- You have stringified JSON inside JSON and need to unescape it
- A config file looks valid but the parser refuses it
- You need to format a minified JSON to read it
- You need to minify formatted JSON to embed in code
How to validate JSON
- Paste your JSON into the validator box
- Click 'Validate'
- Errors show line and column with a hint
How to fix broken JSON
- Paste broken JSON
- Click 'Repair'
- Tool fixes missing commas, trailing commas, unquoted keys
- Review and copy the fixed output
How to escape or unescape JSON strings
- Paste a string
- Choose Escape or Unescape mode
- Copy the result
JSON Shuttle vs alternatives
| Tool | Validate | Format | Repair | Local-Only | Free |
|---|---|---|---|---|---|
| JSON Shuttle | ✓ | ✓ | ✓ | ✓ | ✓ |
| JSONLint | ✓ | ✓ | — | ✓ | ✓ |
| jq | ✓ | ✓ | — | CLI | ✓ |
| Online JSON Viewer | ✓ | ✓ | — | Mixed | with ads |
Frequently Asked Questions
- Is JSON Shuttle free?
- Yes — completely free. No account, no ads, no data tracking.
- Does my JSON data leave my browser?
- No. All validation, formatting, and repair logic runs in your browser. Your data never reaches our servers, and we don't run analytics on it.
- How large a JSON file can I paste?
- For best performance, keep payloads under ~5 MB. The browser engine can technically handle larger, but UI responsiveness drops.
- What kinds of JSON errors can it repair?
- Common issues like missing commas, trailing commas, single quotes around keys, comments (// or /* */), unquoted keys, and incorrect bracket pairing.
- Why does the validator show 'Unexpected token N in JSON at position X'?
- Position X is the character offset where parsing failed. Often this is just before a missing comma or after an unescaped quote. JSON Shuttle highlights the exact line/column.
- Can I use JSON Shuttle offline?
- Yes — after the first load, the entire app runs offline. Bookmark the page and you can work on a plane.
- How is this different from JSONLint?
- Both are browser-based validators. JSON Shuttle adds a repair mode for broken JSON and an escape/unescape mode that JSONLint lacks.
- Is JSON Shuttle open source?
- The validation and repair logic is open. Contact [email protected] for repo access.