JSON Formatter & Validator

Format, validate, and explore JSON. Error highlighting and a collapsible tree included.

❌ Errors: 0
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Idle
Errors

  1. Paste your JSON into the left editor or drag & drop a .json file. Enable AutoValidate to check syntax as you type.
  2. Select the indent size and click “Format” to pretty print or “Minify” to compact. Use “Sort keys” for stable key order.
  3. Open the “Tree” tab to inspect objects and arrays with expandable nodes and counters for keys/items.
FAQ

No. All parsing and formatting run locally in your browser.

We show standard JSON.parse errors with the exact line and column, and we select the character near the error in the input editor.

Very large files depend on your device memory and browser limits. For best performance, keep inputs under a few megabytes.
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This tool is provided for personal and educational use only. We do not host or store any user content or media files on our servers. All processing happens locally in your browser. We are not affiliated with or endorsed by any social network, platform, or company mentioned. Use this service at your own discretion and in compliance with the respective platform’s terms of service.