JSON Formatter

A JSON formatter (also called a JSON beautifier) takes raw or minified JSON and reformats it with consistent indentation and line breaks, making it easier to read and debug.

Paste your JSON into the left panel and click Format — or press ⌘+Enter. Use Minify to compress it, Swap to move output back to input, or Clear to reset both panels. The indent size selector controls how many spaces are used per level.

No. All formatting, validation, and minification runs entirely in your browser. Your JSON data never leaves your device.

The top offenders, in order: trailing commas after the last item in an array or object (legal in JavaScript, illegal in JSON); single quotes instead of double quotes around keys and string values; unescaped newlines or quotes inside strings; missing commas between items; and JavaScript-style comments (// or /* */), which JSON doesn't allow. The Auto-fix button can repair many of these automatically.

Absolutely. The output is standards-compliant JSON — it will parse identically in JavaScript, Python, Go, Rust, Java, or any other language with a JSON library. For production payloads where bytes matter, prefer the minified output. For config files or code reviews, the formatted version is the right choice.