validate-server-response.ts

class Validator {
    validateProperties?(props: (keyof Person)[]){
        props.forEach((prop:string) => {
            if(!this[prop]){
                console.error(`Missing "${prop}" property in object`);
            }
        })
    }
}

enum PersonProperties {
    NAME = 'name',
    AGE = 'age',
    EMAIL = 'email'
}

class Person extends Validator {
    [PersonProperties.NAME]: string;
    [PersonProperties.AGE]: number;
    [PersonProperties.EMAIL]?: string;
    constructor(obj: Person){
        super();
        for(const key in obj){
            this[key] = obj[key];
        }
    };
}

const testPerson = new Person({ name: 'Fred', age: 12 }); // mock server response data

testPerson.validateProperties([PersonProperties.NAME,PersonProperties.AGE,PersonProperties.EMAIL]);
// Result => Missing "email" property in object