JSON Formatter & Validator
Format, validate and minify JSON, with clear error messages.
What is the JSON Formatter?
This tool takes raw, minified or messy JSON and reformats it with consistent indentation so it's easy to read, or validates it and tells you precisely where a syntax error is if it's broken. It can also do the opposite: strip all unnecessary whitespace to minify JSON for production use.
How to use it
- Paste your JSON into the input box.
- Click Format to pretty-print it with your chosen indent size, or Minify to compress it onto one line.
- If the JSON is invalid, an error message explains what's wrong and roughly where.
JSON (JavaScript Object Notation) is the standard data format for web APIs, configuration files, and data interchange between systems. A single missing comma, an extra trailing comma, or unescaped quotation mark is enough to make an entire JSON document invalid, which is why a fast formatter/validator is such a common developer tool — it turns a vague "request failed" error into an exact, fixable problem. This tool uses your browser's native, spec-compliant JSON parser, so validation results match exactly what any standard JSON library would accept or reject.