JSON Validator – Check & Validate JSON Online
JSON Validator
Check JSON syntax, find errors and inspect JSON structure online.
It checks whether the supplied text is valid JSON according to the browser's JSON parser. It also analyzes the structure after successful validation, including objects, arrays, keys, strings, numbers and nesting depth. Processing is performed locally in your browser.
Free Online JSON Validator
Check JSON syntax online and inspect the structure of valid JSON directly in your browser. Paste JSON or load a file to see whether it is valid, review parser error details, and view a formatted preview when validation succeeds.
How to Validate JSON
- Paste JSON into the input area or load a JSON file by clicking or dragging it into the file area.
- Click Validate JSON, or press Ctrl/Cmd + Enter while editing.
- If the JSON is valid, review the formatted preview and structure statistics.
- If it is invalid, use the parser error message and available approximate line, column or character-position details to locate the problem.
- Copy the validated JSON or download it as a JSON file.
JSON Syntax and Structure Check
The validator uses the browser's JSON parser to check syntax. After successful validation, it analyzes objects, arrays, keys, strings, numbers and maximum nesting depth. The validated content is also displayed as a two-space-indented preview, and processing is performed locally in the browser.
Frequently Asked Questions
What does the JSON Validator check?
It checks whether the supplied text can be parsed as valid JSON and then analyzes its structure after successful validation.
Can it show where a JSON error occurred?
When the browser parser provides location information, the tool can show an approximate line and column and, when available, a character position.
Can I validate a JSON file?
Yes. You can click the file area or drag and drop a JSON file, and the tool automatically validates the loaded content.
What JSON statistics are displayed?
For valid JSON, the tool counts objects, arrays, keys, strings and numbers and calculates the maximum nesting depth.
Can I download valid JSON?
Yes. After successful validation, you can download the formatted preview as validated.json.