JSON Formatter & Validator
Free JSON formatter and validator: beautify, minify and inspect JSON with precise error positions. Runs in your browser - data is never uploaded.
Runs 100% on your device - nothing you enter or upload leaves your browser.
How to use the JSON formatter
Paste JSON and press Format for readable, indented output, or Minify to compress it for APIs and configs. Invalid JSON shows the exact position of the first error.
Features
- Validation with precise error line and column.
- Two-space pretty printing, or full minification.
- Optional alphabetical key sorting.
- One-click copy of the output.
Privacy
Your JSON never leaves this page. Formatting runs entirely on your device.
Frequently asked questions
What does "valid JSON" mean?
JSON requires double-quoted strings, no trailing commas, and no comments. The validator pinpoints the exact line and position of the first syntax error.
Is my JSON uploaded to a server?
No. Formatting and validation run entirely in your browser. Your data never leaves your device.
How large a file can I format?
Comfortably several hundred thousand lines on a modern device, since nothing is uploaded. Extremely large files depend on your device memory.
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