What is a JSON formatter?
A JSON formatter takes raw or minified JSON data and re-indents it so the hierarchical structure is easy to read. This is essential when debugging API responses, configuration files, or data exports. Our tool also validates your JSON against the specification, reporting errors with approximate line numbers so you can fix issues quickly.
Beautify vs. minify
Beautifying adds whitespace and line breaks to make JSON human-readable, while minifying strips all unnecessary whitespace to produce the smallest possible payload — ideal for network transmission and storage. Both operations preserve the data exactly; only formatting changes.
Syntax highlighting
The output area colour-codes strings, numbers, booleans, null, and keys so you can visually scan large documents at a glance. Everything runs locally in your browser — your data never leaves your machine.