Ensuring consistency in property formatting strategies

I'm curious if there exists a way to specify the format that an interface property should adhere to. For instance:

interface User {
  age?: number,
  name: string,
  birthdate: string    // must be in 'YYYY-MM-DD' format
}

I came across decorators, but it seems they are only applicable to classes, not interfaces.

I am working on developing an API using node/express and require input validation. Therefore, I am looking into Celebrate, which can utilize joi type Schema for input validation. However, I prefer to define my Schema / view model using TypeScript instead... As you can see, I am trying to use an Interface to outline what the input of a specific endpoint should resemble:

  • age: number, can be omitted
  • name: string
  • birthdate: string in the "YYYY-MM-DD" format

Any assistance or advice would be greatly appreciated :)

validationexpresstypescriptjoi

Answer №1

Appreciate any suggestions or guidance :)

Remember, writing code for validation is essential and won't happen automatically.

There are two different approaches to consider:

External Validation Method

Utilize the validate(obj) => {errors?} function. This involves creating a validate function that checks for errors in an object. You can easily create this type of function on your own.

Internal Validation Method

Rather than using {birthdate:string}, implement something like 

{birthdate:FieldState<string>}
. Here, the FieldState manages validations and errors for a specific field. While this approach is used by , you have the flexibility to develop a similar system yourself.

Regarding Validators

I prefer simple validators like (value) => error? (value to optional error) as they are versatile and can be utilized across various frameworks. Formstate also utilizes this validator. Feel free to explore and find what works best for your individual requirements 🌹

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