JSON Formatter

A JSON formatter and validator that pretty-prints JSON with 2 or 4-space indentation, minifies it for production, and surfaces the parser's exact error message and position when the input is invalid.

This formatter turns unreadable, single-line JSON into cleanly indented, human-readable structure in one click — or does the reverse, minifying a formatted document back to its most compact form for production payloads. JSON is how systems talk to each other — API responses, configuration files, webhooks, exports — but machines emit it as a single unreadable line.

It's also a validator. The formatter parses your input with the same strict rules every JSON consumer uses, so if there's a problem — a trailing comma, single quotes instead of double, an unquoted key, a stray character — you get the parser's actual error message instead of a silent failure later in your pipeline. Fixing JSON here is much faster than deploying and reading a stack trace.

Formatting runs entirely in your browser: API keys, customer records and internal payloads never leave your machine, which is exactly what you want when debugging production data. Use 2-space indentation (the JavaScript ecosystem default) for reading and code reviews, 4-space when you'll be scanning deeply nested structures, and minify when every byte counts. A practical debugging loop: paste the response from your API client, format to inspect the structure, edit the value you're testing, then minify and send it back. The output downloads as a .json file when it's too large to comfortably copy.