formatting
JSON Formatter & Validator
Pretty-print or minify JSON — with syntax validation.
JSON Formatter
Format, validate, sort, and explore JSON. Repair mode fixes trailing commas, single quotes, and comments.
Paste JSON to see formatted output
What is this?
A JSON formatter parses a JSON string and re-serializes it with consistent indentation or no whitespace. The repair mode tolerates common mistakes — trailing commas, single-quoted strings, and // comments — so you can paste real-world config files without manually fixing every lint error first.
Tree view
Click any key or value in the Tree tab to copy its JSONPath to the clipboard. Nodes deeper than 2 levels are collapsed by default — click the arrow to expand.
What is a JSON Formatter?
A JSON formatter parses a JSON string and re-serializes it with consistent indentation (pretty) or no whitespace (minify). This tool also catches syntax errors and reports the exact position of the problem.
How to format JSON
- Paste JSON: Paste your raw, minified, or malformed JSON into the input field.
- Choose mode: Select 'pretty' for readable output or 'minify' to compact it.
- Click Run: The formatted result appears instantly. Use the Copy button to copy it.
Frequently asked questions
- What's the size limit?
- The API accepts up to 1 MB of JSON. For larger files, run the formatter locally with JSON.stringify.
- Does it sort keys?
- Yes — enable the 'Sort keys' option to sort object keys alphabetically at every level of nesting.