JSON Formatter

JSON (JavaScript Object Notation) is the most common format for exchanging data between web servers and applications. A JSON formatter (also called a beautifier or pretty-printer) re-indents JSON so its nested structure is easy to read, while a validator confirms the syntax is correct.

Valid JSON requires matching braces and brackets, double-quoted keys, and commas in the right places — a single missing comma breaks the whole document. Formatting and validating together helps you both read the data and catch syntax errors fast.

The JSON Formatter turns minified or messy JSON into clean, properly indented, human-readable output, and validates it at the same time. Paste an API response or a config blob and instantly see it formatted with consistent indentation — or get a clear error if the JSON is invalid.

Developers work with JSON constantly: API payloads, configuration files, logs, and data exports. Raw JSON is often delivered on a single line or with inconsistent spacing, which is painful to read and debug. Formatting it makes the structure obvious — objects, arrays and nesting all line up — so you can spot the value you need or the bug you're chasing.

Everything is processed locally in your browser, so even sensitive payloads stay on your machine. Choose 2-space, 4-space or tab indentation, then copy the result. It's free with no limits.