What is a JSON Validator?
A JSON validator checks whether JSON data follows valid JSON syntax. It can help developers find malformed objects, arrays, strings, numbers, separators, and other syntax problems before using the data in an application.
How to Validate JSON Online
- Paste your JSON into the validator above.
- Click Validate JSON.
- Review the validation result and error details.
- Correct the JSON and validate it again.
What ToolSwift JSON Validator Checks
- Invalid JSON syntax.
- Missing or unexpected commas and separators.
- Unclosed objects and arrays.
- Invalid strings, numbers, booleans, or null values.
- Trailing commas and other common JSON mistakes.
Why Validate JSON?
JSON is commonly used for APIs, configuration files, data exchange, and web applications. A small syntax error can make JSON impossible for an application to parse. Validation provides a quick way to check the data before it is used or shared.
JSON Validator vs JSON Formatter
A JSON validator checks whether JSON is syntactically valid, while a JSON formatter focuses on indentation and readability. Use the JSON Formatter when you want to beautify valid JSON.
Frequently Asked Questions
Is this JSON Validator free?
Yes. ToolSwift's JSON Validator is available online at no cost.
Does the JSON Validator fix invalid JSON automatically?
No. It reports validation errors so you can review and correct the original JSON yourself.
Can I validate a JSON file?
Yes. Click Browse JSON and select a local JSON file. The file is loaded into the browser for validation.
What happens to my JSON data?
Validation is performed in your browser. The tool does not need to send the JSON text to a server for the validation performed on this page.
Can JSON contain comments?
Standard JSON does not support comments. If comments are included, standard JSON parsing will normally report a syntax error.
