Validate Checker
Validate and quickly check common data formats in one place: JSON, XML, CSV, Base64, UUID, email, URL, and IPv4. Clear pass/fail output with compact error details.
How to use
Use this to validate quick snippets without sending data anywhere.
- Paste data into the input.
- Select a mode (Auto, JSON, XML, CSV, Base64, UUID, Email, URL, IPv4).
- Click Validate to get a pass/fail report.
- If using CSV, set the delimiter (comma by default).
FAQ
What does this validate checker support?
It validates JSON, XML, CSV, Base64, UUID, email, URL (http/https), and IPv4.
Does Auto-detect change my data?
No. It only tries common parsers and reports the first likely match or a clear failure.
Can it show an exact JSON error line?
Browsers often include position details in the JSON error message; the report shows that message as-is when available.
How strict is the CSV validation?
It checks consistent column counts and proper quoting (including escaped quotes). It doesn’t validate data types.
Is this tool offline/private?
Yes. The validator runs in your browser and does not send input to a server.
Why does URL validation reject some links?
This checker considers only http/https URLs valid to avoid treating non-web schemes as “valid URLs” for typical use.
What if my input is huge?
Very large inputs can be slow in any browser; try validating a smaller slice to locate the issue, then re-check the full data.
Continue your workflow
Browse related tools by task. Use the improved core tools for a consistent workspace with file import, downloads and clear validation errors.