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Code & Data Tool
JSON Validator
Validate strict JSON or repair common mistakes with clear explanations.
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About this tool
What is JSON Validator?
JSON Validator checks whether your JSON is strictly valid and explains problems in plain language. It can also repair common mistakes, and it offers live validation as you type.
Useful when you need to
- Check a config or data file before using it
- Find the exact place a JSON error occurs
- Fix single quotes and trailing commas
How to use
How to use JSON Validator
01 02 Turn on live validation
Enable it to check as you type, or run it manually.
03 Read the message
See the error explanation and position.
04 Repair if needed
Use the repair option for common mistakes and review the result.
Tips
Get better results
- Strict JSON does not allow comments, single quotes or trailing commas.
- Always compare repaired output with the original.
FAQ
Frequently asked questions
What counts as valid JSON?
It must follow the JSON standard: double-quoted keys and strings, no comments and no trailing commas.
Does it upload my data?
No.
Can it fix everything?
Only common mistakes. Structural problems may need manual fixing.
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