JSON Validator Online - EXUtil Extended Utilities

Free online JSON validator. Check if your JSON is syntactically correct, pinpoint exact error locations, and validate large files to help debug data issues quickly.

How to use

  1. Paste or import the content you want to process.
  2. Choose an available action and run the tool.
  3. Review the result, then copy or download the output.

Frequently asked questions

What errors can JSON validation detect?
JSON validation can detect various syntax errors, including but not limited to: keys not wrapped in double quotes, missing comma separators, mismatched brackets, using single quotes instead of double quotes, trailing commas, and illegal escape characters.
How to locate errors in JSON?
When JSON format is incorrect, the validation tool displays detailed error information, including error type, error location (line and column numbers), and error description. Based on this information, you can quickly locate and fix problems.
Does passing validation mean JSON is definitely correct?
Passing validation means the JSON syntax fully complies with specifications and can be parsed correctly. However, this does not mean the data's business logic is correct. You still need to verify the actual content and business rules of the data.
What are common JSON errors?
Common errors include: 1) Keys not wrapped in double quotes; 2) Strings using single quotes; 3) Extra commas at the end of objects or arrays; 4) Mismatched brackets; 5) Special characters not properly escaped; 6) Using JavaScript comments.
Is JSON5 format supported?
The current version only supports standard JSON format (RFC 8259) and does not support JSON5 extended features (such as comments, unquoted keys, single-quoted strings, etc.). Please ensure you use standard JSON format for validation.

References

Technical standards and official documentation related to this tool.