About JSON Validator
A JSON document must contain exactly one valid value—an object, array, string, number, boolean, or null. Property names and text values use double quotes. Comments, undefined, and a comma after the last item are not part of standard JSON.
How to use this tool
- Paste or type your content into the input panel.
- Choose Validate JSON to run the operation in your browser.
- Review the result, then use Copy to place it on your clipboard.
Helpful tip: Validation checks syntax, not the meaning of your data. A syntactically valid document may still be missing fields your application requires.
Frequently asked questions
Is my JSON uploaded when I use this tool?+
No. The operation runs on this page in your browser. Toolbox does not receive the text you paste into the input area.
Does this check whether my data is correct for my app?+
The tool checks or transforms JSON syntax. It does not know your application’s schema or business rules, so valid JSON can still have missing or unexpected fields.
What syntax does a JSON document allow?+
Standard JSON requires double-quoted strings and property names. It supports objects, arrays, numbers, booleans, and null, but not comments or trailing commas.