JSON Formatter & Validator
Free online JSON formatter and validator. Paste raw JSON to pretty-print it with 2-space indentation, minify it to a single line, or instantly check whether it's valid — all client-side.
A JSON formatter takes the dense, hard-to-read JSON that APIs and config files spit out and turns it into something a human can actually scan. Paste in a payload, hit Format, and you get clean 2-space indentation with every key and nested object on its own line — the structure becomes obvious at a glance.
The same tool works in reverse: Minify strips every unnecessary space and newline so you can drop compact JSON into a request body or environment variable. Both actions validate the input first, so if a comma or quote is out of place you'll see exactly what went wrong. Everything runs locally in your browser — your data is never uploaded.
Frequently asked questions
What indentation does Format use?
Format pretty-prints your JSON with 2-space indentation, the most common convention for readable config and API payloads.
How does validation work?
Both Format and Minify parse your input with the browser's native JSON parser. If parsing succeeds you'll see a confirmation; if it fails, the parser's error message is shown so you can find the problem.
Is my JSON sent to a server?
No. All formatting, minifying, and validation happen entirely in your browser. Nothing leaves your machine.
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