Free Tool
JSON Formatter & Validator
Format, validate, and minify JSON instantly. Pretty-print with 2 or 4 space indentation or compress to a single line — all in your browser, no sign-up needed.
JSON Formatter & Validator
Indent:
What is a JSON formatter?
Pretty-printing JSON adds consistent indentation and line breaks, making nested structures easy to read. Minifying removes all whitespace to reduce payload size.
Validation
This tool validates your JSON as you type. Common errors include trailing commas (not allowed in JSON), single-quoted strings (must be double-quoted), and unquoted object keys.
Developer use cases
JSON formatting is useful when inspecting API responses, reading config files, comparing payloads, and reviewing log output that was minified for transmission.
How to use
- Paste your JSON into the input area.
- Click Format to pretty-print, or Minify to compress. Validation errors appear inline.
- Click Copy to copy the formatted result to your clipboard.
Your JSON stays in your browser — no data is sent to any server.
Frequently Asked Questions
- What is JSON formatting?
- JSON formatting (pretty-printing) adds consistent indentation and line breaks to a compact JSON string, making it human-readable.
- What is JSON minification?
- JSON minification removes all unnecessary whitespace, producing the smallest possible valid JSON string for network transmission.
- How do I validate JSON?
- Paste your JSON and click Validate Only. It reports whether it is valid and shows the exact error message if not.
- Is this JSON formatter free?
- Yes, completely free with no sign-up. All processing happens in your browser.