JSON Formatter & Validator
Format, minify and validate JSON — 100% in your browser, no data transmitted
Output
Valid JSON
Size
0 B
Nesting Depth
0
Keys
0
Array Items
0
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Frequently Asked Questions
What common JSON errors does this tool catch?
It detects trailing commas (e.g. { “a”: 1, }), single quotes instead of double quotes, JavaScript-style comments (not valid in JSON), and unquoted object keys — all common mistakes that break strict JSON parsers.
What’s the difference between Format and Minify?
Format adds indentation and line breaks for human readability. Minify strips all unnecessary whitespace to produce the smallest possible payload for production use.
Is it safe to paste confidential data here?
Yes — all processing runs 100% locally in your browser. Nothing is transmitted to any server, so it’s safe to use with confidential API payloads and production secrets.
Why does validation fail even though my JSON “looks right”?
JSON is stricter than JavaScript object literals — it requires double-quoted keys and strings, no trailing commas, and no comments. Run Validate to see the exact error position.