JSON Formatter
Format messy JSON into readable, indented output directly in your browser.
Open ToolJSON Validator
Validate JSON and see a clear success message or parse error.
About JSON Validator
JSON Validator checks whether JSON text is valid and reports syntax problems.
It is useful before sending data to an API, saving a config file, or debugging a payload that fails to parse.
How to Use JSON Validator
- Paste the JSON you want to check.
- Run validation.
- Read the success or error message.
- Fix the highlighted syntax issue and test again.
Common Use Cases
- Debugging broken API payloads.
- Checking config files before use.
- Learning common JSON syntax mistakes.
Frequently Asked Questions
What input should I paste into JSON Validator?
Paste the matching developer content for this tool, such as code, markup, encoded text, a timestamp, regex pattern, or metadata values.
When is JSON Validator useful?
It is useful for debugging broken api payloads and checking config files before use.
Should I paste private secrets into JSON Validator?
Avoid pasting API keys, passwords, tokens, or private production data into any online tool, even when the processing is browser-based.