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FREE JSON FORMATTER & VALIDATOR
Format, validate, and minify JSON instantly. Free online JSON formatter with error detection. No signup, no server upload needed.
What is a JSON Formatter?
A JSON formatter takes compressed or messy JSON and reformats it with proper indentation, making it easy to read and debug. It also validates that your JSON is syntactically correct.
Common JSON Errors It Detects
- Missing or extra commas
- Unclosed brackets or braces
- Unquoted property names
- Single quotes instead of double quotes
- Trailing commas (not valid in standard JSON)
Frequently Asked Questions
What does JSON formatter do?+
It takes raw, unformatted JSON and adds proper indentation, line breaks and syntax highlighting to make it human-readable.
Does it validate JSON?+
Yes. If your JSON has errors, it tells you what went wrong and where.
Can I minify JSON?+
Yes. Click Minify to remove all whitespace and produce compact single-line JSON.
Is my JSON sent to any server?+
No. Everything runs in your browser.
What is the maximum size?+
No strict limit, though very large JSON files may be slow in the browser.