Format, validate and minify JSON
Built & maintained by Pappu Venkata Subbi Reddy, founder of Clacify
The JSON Formatter beautifies, validates, and minifies JSON data directly in your browser. Paste messy or minified JSON and it pretty-prints it with proper indentation and syntax highlighting; if there is a syntax error, it points to where the problem is so you can fix it fast. A minify mode strips all whitespace to produce the smallest valid output for APIs and config files. Developers use it dozens of times a day to inspect API responses, clean up log output, and debug payloads. Because it runs entirely client-side, you can safely format JSON containing tokens, keys, or customer data without it ever being sent to a server.
The tool parses your input with the browser's native JSON engine (JSON.parse), which both validates the structure and surfaces precise error messages — including the position — when the JSON is malformed. Valid data is re-serialised with JSON.stringify using a configurable indentation (typically two spaces) for the beautify view, or with no whitespace for the minify view. Syntax highlighting is applied to the formatted output for readability. All parsing and formatting happen locally in JavaScript; your data never touches a network, so it is safe for payloads containing credentials or personal information.
Paste your JSON into Clacify's JSON Formatter and it instantly indents and syntax-highlights it. If the JSON has errors, the validator highlights the exact location. Click Minify to compress it back into a single line for production use.
Beautifying adds indentation and newlines to make JSON readable for humans. Minifying removes all whitespace to produce the smallest possible string — ideal for API responses and config files to reduce data transfer size and improve load times.