JSON Formatter & Validator

JSON (JavaScript Object Notation) is a lightweight data-interchange format. It's easy for humans to read and write and easy for machines to parse and generate. JSON is built on two structures: a collection of name/value pairs (often called an object) and an ordered list of values (an array). It has become the standard format for APIs, configuration files, and data storage across the web.

Paste your raw or minified JSON into the input field above and click Format. The tool parses the JSON and re-serializes it with 2-space indentation, making nested objects and arrays easy to read. This is sometimes called "pretty-printing" or "beautifying" JSON.

Click Validate to check whether your input is valid JSON. If the JSON is malformed — for example, a missing comma, an extra trailing comma, unquoted keys, or mismatched brackets — the tool will display the exact error message and position so you can fix it quickly.

Click Minify to strip all unnecessary whitespace, newlines, and indentation from your JSON. This produces the most compact representation, which is useful for reducing payload size in API responses, configuration files, or anywhere bandwidth matters.

Trailing commas — JSON does not allow a comma after the last item in an object or array. Single quotes — JSON requires double quotes around keys and string values. Unquoted keys — unlike JavaScript objects, JSON keys must be wrapped in double quotes. Comments — JSON does not support comments of any kind. Missing brackets — every opening brace or bracket needs a matching closing one.

Yes. This tool runs entirely in your browser using JavaScript. Your JSON data is never sent to a server, stored, or logged. You can verify this by opening your browser's network tab — no requests are made when you format, validate, or minify.