JSON Validator
JSON Formatter & Error Detection
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Tip:Enter JSON code and click "Validate & Format" button, the tool will automatically detect if the JSON format is correct. If correct, it will show formatted results; if incorrect, it will show specific error information and error location.
About JSON Validator
Check whether JSON is valid and locate syntax errors quickly. The validator reports useful error context so you can fix missing commas, unclosed strings, unmatched brackets, and illegal characters.
Common Uses
- Validate API request and response payloads.
- Find syntax errors in config files.
- Check JSON copied from logs, docs, or databases.
- Prepare JSON before formatting or diffing.
FAQ
Can the validator show line and column information?
Yes. When possible, MKDiff shows line, column, position, and a focused error message.
Does it support comments in JSON?
Standard JSON does not support comments. Remove comments before validation unless your target system accepts a JSON-like format.
Can I format valid JSON after validation?
Yes. The validator can format valid JSON so the structure is easier to read.
Is validation done server-side?
No. Validation runs in the browser and your JSON stays on your device.