JSON Formatter
Format, validate and minify JSON.
Syntax highlighting, error detection.
How to use JSON Formatter
- 1Paste your JSON in the left area.
- 2Click "Beautify" to format or "Minify" to compact.
- 3Copy or download the result.
Practical guide: JSON Formatter
Why use this tool?
Formatting and validating JSON is a daily task for developers working with APIs, config files or NoSQL databases. Unformatted JSON is unreadable; invalid JSON crashes parsers. This tool formats, minifies and precisely locates syntax errors with the exact line and column number.
Strict JSON does not allow comments, trailing commas or unquoted keys. For these cases, convert to pure JSON first with a dedicated tool (JSON5 → JSON).
Privacy and limits
Processing is 100% local via native browser JSON.parse and JSON.stringify. API payloads, auth tokens and config data never leave your device.
JSON Formatter is designed to be free, fast and available without creating an account. It suits freelancers, students, marketing teams, developers and small businesses that need to handle a task efficiently.
Best practices
- Never paste real API keys or secrets into any online tool (precaution principle).
- Minify mode reduces size by 20–50% — useful for API responses.
- 2-space indent is the JS/TS standard; 4 spaces suits Python.
Related searches: json formatter, json beautifier, json validator.
Frequently asked questions
Is my JSON sent anywhere?⌄
No. Formatting uses the browser's native JSON.parse. Your data stays private.
Which indent to choose?⌄
2 spaces is the JavaScript/TypeScript standard. 4 spaces fits Python or more airy reading.
Does minifying really reduce size?⌄
Yes, typically by 20–50%. Useful for APIs and cache storage where every byte counts.
Why is my JSON invalid?⌄
Common causes: trailing comma, single quotes instead of double, unquoted keys, comments (not allowed in strict JSON).
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