What is the most effective method to clean an object in JavaScript while maintaining security?

Question

What is the most effective method to clean an object in JavaScript while maintaining security?

To circumvent the JavaScript delete operator (source: https://developer.mozilla.org/de/docs/Web/JavaScript/Reference/Operators/delete), I have opted to utilize object destructuring to eliminate private properties:

//sample helper-function in ts

const sanitizeUser = (user: User): UserSanotized => {
                const { googleData, ...rest } = user
                return rest
            }

I am curious whether it is safe to use the returned value of sanitizeUser, ensuring that the googleData property cannot be retrieved.

javascript typescript delete-operator

Answer 1

Answer №1

Rest assured that once the sanitizeUser function is applied, the resulting object will not contain the googleData property. This likely indicates that accessing the value of this property from the sanitized object may not be possible, unless the original User object contains properties that create a reference loop back to itself (such as in parent-child relationships). In such cases, the sanitized object will retain these references and provide access to the googleData via those properties.

To illustrate this concept, consider the following equivalent JavaScript code snippet:

const sanitizeUser = (user/*: User*/)/*: UserSanitized*/ => {
    const { googleData, ...rest } = user;
    return rest;
};

const user = {
    googleData: "secret data!",
};
user.self = user;

const sanitized = sanitizeUser(user);
console.log(sanitized.self.googleData); // "secret data!"

If the User object does not create any self-references, then the sanitized object is secure and there is no pathway to retrieve the googleData property from it.

Answer 2

Rest assured that once the sanitizeUser function is applied, the resulting object will not contain the googleData property. This likely indicates that accessing the value of this property from the sanitized object may not be possible, unless the original User object contains properties that create a reference loop back to itself (such as in parent-child relationships). In such cases, the sanitized object will retain these references and provide access to the googleData via those properties.

To illustrate this concept, consider the following equivalent JavaScript code snippet:

const sanitizeUser = (user/*: User*/)/*: UserSanitized*/ => {
    const { googleData, ...rest } = user;
    return rest;
};

const user = {
    googleData: "secret data!",
};
user.self = user;

const sanitized = sanitizeUser(user);
console.log(sanitized.self.googleData); // "secret data!"

If the User object does not create any self-references, then the sanitized object is secure and there is no pathway to retrieve the googleData property from it.

What is the most effective method to clean an object in JavaScript while maintaining security?

Answer №1

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