> For the complete documentation index, see [llms.txt](https://kinesis-school-of-programming.gitbook.io/nestjs-unleashed/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://kinesis-school-of-programming.gitbook.io/nestjs-unleashed/core-module-backend-development-with-nestjs/validation/more-specific-validation.md).

# More specific validation

Well, the fields are being validated, but the validation is too lenient. It can be much more robust and focused. We can think of the following rules:

* <mark style="color:blue;">`name`</mark> - Between two and fifty characters. We can achieve this with <mark style="color:blue;">`@Length(2, 50)`</mark>.
* <mark style="color:blue;">`email`</mark> - Must be a valid email. We can use <mark style="color:blue;">`@IsEmail()`</mark>.
* <mark style="color:blue;">`phone`</mark> - Must be a valid phone number. We can use <mark style="color:blue;">`@IsPhoneNumber()`</mark>, and even define a <mark style="color:blue;">`region`</mark>, like US.
* <mark style="color:blue;">`password`</mark> - In a future moment, we'll validate it using <mark style="color:blue;">`@Matches()`</mark> and a **regex** for interesting, custom validation. For now, let's leave it as it is.

> It can be a great idea to check on the [available validators](https://github.com/typestack/class-validator#validation-decorators), you may find something interesting.