JSON Formatter & Validator

Format, validate and minify JSON locally with configurable indentation and downloadable output.

A fast, client-side JSON beautifier, parser, and validator. Format messy API payloads into human-readable JSON, validate syntax with pinpoint line error detection, and minify code for production with zero server communication.

How to use

  1. Paste or type raw JSON data into the left input editor.
  2. Choose your preferred indentation (2 spaces, 4 spaces, or Tabs).
  3. Click "Beautify" to format or "Minify" to compact your JSON.
  4. Review immediate syntax diagnostics, key counts, and byte sizes.
  5. Copy the clean result to your clipboard or download it as a .json file.

Frequently asked questions

Is my JSON uploaded to any server?

No. All parsing, validation, and beautification runs purely inside your browser using standard JavaScript engines. No network calls are made.

What happens if my JSON has syntax errors?

The validator identifies the exact line and column number of the error with descriptive diagnostics to help you fix it immediately.

Can this tool format large JSON files?

Large or deeply nested JSON can slow down or exhaust browser memory. Start with a smaller sample and keep the original.

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