Remove fields from typescript interface object

Question

I am getting a json response and storing it in mongodb, however the fields that I don't need are also getting in to the database, is there anyway to strip the uneseccary fields?

interface Test{
    name:string
};
const temp :Test = JSON.parse('{ "name":"someName","age":20 }') as Test;
console.log(temp);

output :

{ name: 'someName', age: 20 }

Answer 1

You can use a function that picks certain properties from a given object:

function pick<T, K extends keyof T>(obj: T, ...keys: K[]): Pick<T, K> {
    const copy = {} as Pick<T, K>;

    keys.forEach(key => copy[key] = obj[key]);

    return copy;
}

Then:

let obj = { "name": "someName", "age": 20 };
let copy = pick(obj, "name") as Test;
console.log(copy); // { name: "someName" }