JSON Formatter & Validator
Format, minify, and validate JSON entirely in your browser — nothing is uploaded, and values are never silently changed.
Input
Result
Enter JSON above, then Format, Minify, or Validate.
Your JSON is processed locally in your browser and is not uploaded.
Paste any JSON into the box above. Format rewrites it with readable indentation, Minify collapses it to a single line, and Validate checks it without changing anything. For example, formatting {"a":1,"b":[1,2]} produces the same data spread across multiple indented lines — the underlying values never change, only the text layout does.
This checks that your text is syntactically valid JSON (via the browser’s own JSON parser) — it does not validate against a JSON Schema or any external specification.