JSON is the lingua franca of web APIs, but raw responses often arrive minified into a single dense line. A JSON formatter re-indents that data into a clean, readable structure so you can actually understand it.
Beautify and validate
Pretty-printing adds consistent indentation and line breaks, revealing the shape of nested objects and arrays. Crucially, the act of parsing also validates the JSON — if it is malformed, the formatter tells you exactly where it breaks.
Minify for production
The reverse is also useful: minifying strips whitespace to shrink payloads for faster network transfer. A good tool does both, so you can read during development and compress before shipping.
Format JSON privately
Paste your JSON and beautify or minify it locally — no server round-trip, so even sensitive data stays on your device.