JSON Formatter

Validating only checks whether the text is well-formed JSON and reports the first error it finds, without changing anything. Formatting re-indents valid JSON into a readable, properly nested structure (and minifying does the reverse). Every format and minify also validates first, so if your JSON is broken you'll get a precise error instead of mangled output.

Yes. The repair option fixes the most common mistakes automatically — trailing commas, single quotes instead of double quotes, missing quotes around keys, and stray comments — and returns clean, valid JSON. It's great for pasting a loose object copied from JavaScript or a log, but always review the result, since repairing genuinely ambiguous input involves a few assumptions.

The interactive tree view turns your JSON into a collapsible outline so you can expand and collapse objects and arrays instead of scrolling through raw text. It's the fastest way to understand the shape of a large API response or find one value buried several levels deep, and it works alongside the formatted text — your data stays in the browser the whole time.

Yes. Sorting reorders every object's keys alphabetically, recursively through nested objects, while leaving array order untouched. This makes two JSON documents easier to compare or diff and gives configuration files a predictable, consistent layout.

It should. The tool uses your browser's built-in, highly optimized JSON engine, so formatting and validating multi-megabyte files is typically near-instant. You can upload a .json file directly, and because all processing happens locally, even big or sensitive files never leave your device.