71 chars · 4 lines
Two-way sync · Edit either side and the other updates automatically.
Valid JSON
2 keys1 arrays1 objects3 depth71 chars
Search JSON
71 chars · 4 lines
Two-way sync · Edit either side and the other updates automatically.
JSON validation guide
Paste JSON into the validator above to check whether it follows standard JSON syntax. Valid data can be formatted for easier review, while invalid data includes an error message, line, column, and nearby context. Processing stays in your browser.
A JSON validator parses the complete document and confirms that objects, arrays, strings, numbers, booleans, and null values use valid JSON grammar. Formatting is only produced after the input can be parsed successfully.
Validation checks syntax rather than business rules. A payload can be valid JSON while still missing fields required by an API or application.
The most frequent problems are trailing commas, single-quoted strings, unquoted object keys, mismatched brackets, and quotation marks or line breaks that were not escaped inside a string.
VetaTool performs validation, formatting, and error inspection in the browser. API responses, configuration files, and copied request bodies are not sent to a validation server.
Large inputs pause automatic recalculation and wait for you to start processing, which avoids repeatedly parsing the document while you are still editing it.
The input contains a trailing comma. Removing it produces standard JSON that can be parsed and formatted.
{
"name": "Ada",
"active": true,
}{
"name": "Ada",
"active": true
}Common questions
No. JSON parsing, validation, formatting, and error inspection run locally in your browser.
Validation checks whether the input follows JSON syntax. Formatting rewrites already valid JSON with consistent indentation and line breaks.
No. Standard JSON does not allow comments or trailing commas, even though some JavaScript-oriented formats accept them.
Yes. When the parser exposes a position, VetaTool reports the line, column, absolute character, and nearby source context.