What is the JSON Formatter & Validator?
Minified API responses and hand-edited config files are hard to read as one long line. This tool pretty-prints JSON with proper indentation so you can actually read the structure, validates it and points out exactly where a syntax error is (a missing comma, an unquoted key, a trailing bracket), and can also minify JSON back down for production use.
How to Use This Tool
- Paste your JSON into the Input box.
- Click Format to pretty-print it, or Minify to compress it to one line.
- If the JSON is invalid, the exact error and position are shown instead.
Frequently Asked Questions
Does this validate my JSON?
Yes — invalid JSON shows a clear error with the problem location; valid JSON is pretty-printed with indentation.
Is my data sent to a server?
No. Parsing and formatting happen entirely in your browser.
Last updated: August 2026