JSON Formatter
Format and validate JSON online for free. Beautify minified JSON, fix syntax errors and copy clean output.
Input
Output
Output will appear here after formatting…
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How to format JSON online for free
- Paste raw, minified, or malformed JSON into the input box (no signup needed)
- Click Format to pretty-print with indentation, Minify to strip whitespace, or Validate to check for syntax errors
- Switch to Tree view to explore nested objects and arrays interactively
- Click Copy to copy the formatted output to your clipboard
Why use our JSON Formatter?
Minified JSON from an API response is nearly impossible to read as a single line. Our formatter adds consistent indentation and line breaks, turning a wall of text into a structured document you can scan and understand at a glance. The syntax highlighter uses colour to distinguish keys, strings, numbers, booleans, and null values — crucial when debugging deeply nested objects.
The validator catches syntax errors and tells you exactly where the problem is — a missing comma, an unmatched bracket, a stray trailing comma that would break a strict JSON parser. Fixing the error is faster when you know the line number.
Everything runs entirely in your browser — JSON is never sent to any server, making it safe to paste API keys, internal data, or any sensitive payload you are debugging. No account, completely free.
Frequently Asked Questions
A JSON formatter (also called a JSON beautifier or pretty-printer) takes minified or poorly indented JSON and reformats it with consistent indentation so it is easy to read and understand. This tool lets you choose 2-space, 4-space, or tab indentation.
Paste your JSON into the input box and click Validate. The tool uses the browser's native JSON.parse() to check your JSON. If there's a problem, it reports the exact line and column where the error occurs and describes what went wrong.
Format (beautify) adds indentation and line breaks to make JSON human-readable. Minify does the opposite — it removes all unnecessary whitespace to produce the smallest possible JSON string, ideal for sending over a network or storing in a file where size matters.
JSON beautifier is another name for a JSON formatter. It reformats compact JSON into a structured, indented layout with syntax highlighting for keys, strings, numbers, booleans, and null values — making it far easier to read and debug.
Common causes: trailing commas after the last item in an object or array (not allowed in JSON, unlike JavaScript), single quotes instead of double quotes, unquoted keys, comments (JSON has no comment syntax), or a missing closing bracket/brace. The validator will tell you the exact line and column of the first error.
JSON is a text format and a strict subset of JavaScript object notation. Unlike JS objects, JSON requires double-quoted keys and string values, does not allow trailing commas, does not support undefined or functions as values, and has no comment syntax. A valid JSON file is also valid JavaScript, but not vice versa.
Yes — the formatter runs in any mobile browser with no installation required. Paste or type JSON on iPhone, Android, or iPad and format, validate, or minify it instantly.
Yes. Formatting, validating, and minifying JSON of any size is completely free with no account required. Everything runs in your browser — nothing is sent to a server.