JSON Formatter & Validator
Check JSON syntax, add readable indentation, minify data or sort object keys. Everything runs locally in your browser.
JSON input
Clean output
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Privacy and limits
Your JSON is processed only in this page. Avoid pasting secrets into any online tool. Extremely large files may be better handled in a local code editor.
What each action does
Format adds indentation without changing the parsed data. Minify removes unnecessary whitespace for compact transfer. Validate checks whether the input can be parsed as JSON. Sort keys orders object properties for easier comparison; array order remains meaningful and should not be treated as interchangeable.
Valid JSON example
{"project":"TrendPromptLab","tools":32,"published":true} is valid because property names and text values use double quotes, values use supported JSON types, and there is no trailing comma. Formatting it across multiple lines improves readability while minifying returns the compact form.
Common syntax errors
JSON does not allow single-quoted strings, comments, trailing commas, unquoted property names, undefined, NaN or functions. Escape quotation marks and backslashes inside strings. If validation fails, inspect the reported position and the character immediately before it because a missing comma or quote can make the next token appear incorrect.
Limits of validation
Valid syntax does not prove that data matches an API's required schema or that values are trustworthy. This tool does not check required fields, formats, numeric ranges, duplicate-key intent or business rules. Numbers may also lose precision when parsed by JavaScript, so handle very large integers as strings when exact digits matter.