Beautify, minify, and validate JSON online instantly. 100% browser-based — your data never leaves your device.
Clean up and validate your JSON in 3 steps
Paste or type your raw, minified, or broken JSON into the input box.
Format for readability, minify for production, or just validate the syntax.
Copy the result to your clipboard or download it as a .json file.
JSON (JavaScript Object Notation) is the backbone of modern web APIs, configuration files, and NoSQL databases. But raw JSON returned by an API or exported by a tool is often minified into a single unreadable line, or worse, contains a syntax error like a missing comma or an extra bracket. Our JSON Formatter instantly beautifies, minifies, and validates your JSON entirely inside your browser.
This tool never uploads your data to any server. Parsing and formatting happen locally in your browser using native JavaScript, making it safe for API keys, internal configs, and confidential payloads.
Minified JSON strips all unnecessary whitespace and line breaks, which reduces payload size for production APIs, config files bundled with an app, or data sent over slow networks.
{"a": 1, "b": 2,} — JSON does not allow a comma after the last item.{name: "test"} must be quoted: {"name": "test"}.{ and [ must have a matching closing } or ].