CODEWITHSUNDEEP
javascriptjsonobjectstringify
Italik
Italik

Reputation: 696

How to change nested JSON value using stringify replacer?

I use JSON.stringify(value, replacer) to mask sensitive data in JSON object.

const inputJsonObject = 
     { 
       "id": "uniqueId",
       "value": "objectData",
       "user": {
         "password": "qwerty"
       }
     };

const hideDataMethod = JSON.stringify(inputJsonObject, (key, value) => {
  const dataToHide = ['id', 'user.password'];

  return dataToHide.indexOf(key) === -1 ? value : 'xxx';
});

console.log(hideDataMethod);

How to get to user.password value? The above solution works for id but doesn't for password.

Upvotes: 1

Views: 1531

Answers (1)

T.J. Crowder
T.J. Crowder

Reputation: 1074295

It doesn't work for password because you're looking for a property called "user.password", but there is none; the property's name is password, not user.password. (It's a property on an object that's referenced by the user property on another object, but that has nothing to do with the property name.) If you remove the user. part of that, it will work. Beware that doing it removes all id and password properties from all objects in the object graph being stringified:

const inputObject = {
    "id": "uniqueId",
    "value": "objectData",
    "user": {
        "password": "qwerty"
    }
};

const dataToHide = ["id", "password"];
const json = JSON.stringify(inputObject, (key, value) => {
    return dataToHide.indexOf(key) === -1 ? value : "xxx";
});

console.log(json);

(I also changed the name of a couple of variables that had misleading names.)

But I would sanitize it before converting it to JSON rather than during:

const tmp = {
    ...inputObject,
    id: "xxx",
    user: {
        ...inputObject.user,
        password: "xxx",
    }
};
const json = JSON.stringify(tmp);

Upvotes: 3

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