JSON Formatter & Validator

About JSON Formatter & Validator

Paste your JSON to instantly format, validate, beautify, or minify it. Highlights syntax errors with line numbers. Supports large JSON files processed entirely in your browser.

How To Use

  1. Paste your JSON — minified, pretty-printed, or broken — into the input box, or drop a .json file onto the page.
  2. The formatter re-indents and validates it as you type; any syntax error is flagged with its line and column so you can jump straight to the fix.
  3. Choose Beautify for readable indentation or Minify to strip whitespace, then copy the result or download it as a file.

Example

Input: A one-line API response like {"user":{"id":1,"roles":["admin","editor"]},"active":true}.

Output: The same payload re-indented over multiple lines with consistent spacing — or, if a comma or brace is missing, the exact line where parsing failed.

Who Uses JSON Formatter & Validator

  • Developers who prefer private, browser-only tools for formatting, validation, and data work.
  • Engineers who need fast local tools without installing anything or uploading code.
  • Teams that want private — files and text stay on your device and are never uploaded to a server.

Frequently Asked Questions

Can I validate JSON?

Yes — the tool highlights syntax errors and shows the exact line and position of any issue.

Is there a size limit?

No — JSON is processed in your browser with no upload limits.

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