JSON Formatter & Validator

Minified or machine-generated JSON — like most raw API responses or database exports — is usually a single unbroken line, which makes it nearly impossible to scan by eye or diff against another version. Formatting (also called "beautifying" or "pretty-printing") re-indents that same data with consistent spacing and line breaks so you can quickly find a specific field, spot a missing value, or compare two payloads.

The vast majority of invalid JSON comes down to a handful of repeat offenders: a trailing comma after the last item in an object or array, single quotes instead of double quotes around keys/strings, an unquoted key, a missing comma between entries, or an unescaped double quote inside a string value. This tool's error panel tells you the line and character position JavaScript's own parser stopped at, which is usually right at or just after the actual mistake.

Beautify re-indents your JSON with 2-space nesting and line breaks so humans can read it easily — ideal for debugging, code review, or documentation. Minify strips all of that whitespace down to a single compact line, which is what you'd actually send over the wire in production since it reduces payload size without changing the data itself. Both produce functionally identical JSON; only the formatting differs.

Yes. Parsing, validating, formatting, and minifying all happen locally using your browser's built-in JSON.parse and JSON.stringify — nothing you paste is ever sent to a server, logged, or stored. That makes it safe to use with real (even sensitive) API payloads while debugging, unlike tools that proxy your input through a backend.