Free online tool
JSON Validator
Check whether JSON is valid and locate syntax errors.
Updates automatically in your browser.
Paste JSON, XML or YAML to validate.
How to use this tool
- 1. Paste your documentAdd the JSON, XML or YAML you want to validate.
- 2. Check the statusValid documents appear in green; errors show line and column details.
- 3. Fix and recheckUse Go to error, edit the source and review the updated status.
Frequently asked questions
Does the validator change my JSON?
No. It only checks whether the input can be parsed as valid JSON.
What input does JSON Validator expect?
Use the format shown by the workspace fields and examples. Check whether JSON is valid and locate syntax errors.
What happens when JSON Validator receives invalid input?
The tool displays validation feedback or an error instead of silently returning an unreliable result.
Tool guide
About JSON Validator
Example
Input
{"name":"Toolsiva",}Output
Invalid JSON: trailing commaCommon use cases
- Debug API payloads
- Check configuration
- Validate test data
- Review imports
What is JSON Validator?
JSON Validator helps you check JSON syntax and identify errors that prevent parsing.
It works directly in the browser and is designed for quick, focused tasks without requiring an account.
When to use JSON Validator
Common uses include debug api payloads and check configuration.
It can also help with validate test data and review imports.
Practical tips
JSON strings require double quotes.
Valid syntax does not guarantee correct business data.
Privacy and processing
This tool processes its working input in your browser and does not intentionally upload it to a Toolsiva application server.
Avoid entering confidential material when your browser, device, extensions or clipboard environment is not trusted.
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