Tech & Web
JSON Formatter & Validator
Validate, prettify, format, and minify JSON strings with instant syntax error locations.
Inputs
Results
Validation Status
Valid JSON
How It Works
The JSON formatter utilizes JavaScript's native JSON parser engine. `JSON.parse()` checks structures, throwing detailed parsing exceptions for syntax failures (such as hanging commas or unquoted keys). Prettification is performed via `JSON.stringify(Object, null, Spacing)`, while minification removes whitespace characters.
Formula Used
Prettified JSON = NativeJSONStringify(ParsedObject, null, Spacing)
JSON text is parsed into a tree structure. Prettification then converts the object tree back to text, inserting line breaks and standard indentation spacing to make it human-readable.
Worked Example
Here is a step-by-step example of how these values are calculated:
JSON
{"name":"ledger","tools":49}
Result: Result: Prettified syntax representation with correct indentation and syntax validity confirmation.
Frequently Asked Questions
Can I validate keys with single quotes?
No. The standard JSON specification (RFC 8259) requires double quotes (`"`) around all keys and string values. Single quotes represent invalid JSON syntax.
Does this tool support JSON5 or comments?
This tool strictly uses the native `JSON.parse` engine, which adheres to standard strict JSON formatting. Comments (`//` or `/*`) are not permitted.