JSON Formatter
Format, validate and minify JSON directly in your browser.
JSON is formatted locally in your browser and is never sent anywhere.
About this tool
This tool parses your JSON and re-serializes it, either pretty-printed with readable indentation or minified onto a single compact line, using the same strict JSON specification used by APIs, configuration files and most programming languages.
Formatting messy or minified JSON — the kind you often get from an API response or a browser's network inspector — makes it far easier to read, debug, and spot structural problems like mismatched brackets.
If your JSON has a syntax error, the tool's error message tells you specifically what couldn't be parsed, rather than leaving you to hunt through the text character by character.
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Frequently asked questions
- Is my JSON data sent to a server?
- No. All formatting and validation happens locally in your browser using JavaScript's built-in JSON parser — nothing you paste here ever leaves your device.
- What happens if my JSON is invalid?
- The tool shows an error message describing what could not be parsed (for example, a missing comma or an unterminated string), so you know exactly what to fix rather than just being told "invalid JSON".
- What's the difference between formatting and minifying?
- Formatting (pretty-printing) adds indentation and line breaks so JSON is easy for humans to read. Minifying strips all unnecessary whitespace to produce the smallest possible file size — useful before sending data over a network or storing it compactly.
- Why does JSON reject trailing commas or single quotes?
- The JSON specification is intentionally stricter than JavaScript object syntax: it requires double quotes around keys and strings, and does not allow trailing commas or comments. This tool follows the strict specification, the same one used by APIs and config files.