JSON Formatter & Validator
Format, beautify, and validate JSON instantly.
JSON (JavaScript Object Notation) is the most common data interchange format on the web. Developers, data engineers, and API consumers frequently encounter minified or malformed JSON that is difficult to read. Our JSON Formatter & Validator beautifies, minifies, and validates JSON with clear, actionable error messages.
Paste or type your JSON into the editor. Click Format to indent it with 2 or 4 spaces for readability, or click Minify to strip whitespace and reduce file size for API requests and data transfer. The Copy button copies the formatted output to your clipboard in one click.
The validator checks your JSON against the ECMA-404 standard using a native JSON parser. If there is a syntax error, we show you the exact error message and approximate line/column position so you can fix it quickly. Common issues include missing commas, trailing commas, unquoted keys, and single quotes instead of double quotes.
Like all of our tools, your JSON is processed entirely in your browser. No data is sent to our servers, so you can safely format API responses containing secrets, tokens, customer data, or confidential configurations. The tool works offline once the page has loaded.