Input Validation
Enter a value, choose the rules that matter, and inspect a local validation report.
A QUICK WALKTHROUGH
How to use this tool
- Enter the value to inspect.
- Choose required, length, and pattern rules.
- Run validation and review each rule result.
A focused local rule set
This tool checks one text value with required, minimum length, maximum length, email, URL, or custom regular-expression rules. It does not submit the value or call a service.
Client-side feedback only
Validation runs locally in your browser. A passing result is not server-side security validation, authorization, sanitization, or proof that another system will accept the value.
GOOD TO KNOW
Common questions
Can I use my own pattern?
Yes. Enter a JavaScript regular-expression pattern without slash delimiters. Invalid patterns are reported locally.
Does this protect a server?
No. Treat the result as user-interface feedback and repeat all security and business checks on the server.