stringify object array to JSON Selectively

Question

I have an Object array named users. The object format in this array looks like this:

var userExample = {pub:{name:'John', id:'100'}, priv:{location:'NYC', phone:'000000'}};

As a restful service, clients may request information of all users. And obviously I just want to send public information to them. So I want to serialize my data selectively by keys(priv key will be ignored)

Here is my code snippet:

var users = [];
function censor(key, value) {
  if (key == priv) {
    return undefined;
  }
  return value;
}

app.get('/listUsers', function(req, res){
  res.end(JSON.stringify(users, censor));
});

When I run these code, an error occurred:

ReferenceError: priv is not defined

I'm a Javascript beginner, please help.

Denys Séguret · Accepted Answer · 2016-06-07 08:14:51Z

1

Change priv to "priv".

But your approach is dangerous. In similar conditions I usually create a new object to export and I explicitly copy the properties which should be exported, this way there's no risk of leak on future data structure changes. A white list is always more future proof than a black list.

answered Jun 7, 2016 at 8:14

Denys Séguret

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1 Comment

Ray Over a year ago

Thanks, you're correct. And thanks again for your advice, I'll try that way.

Michael Cole · Accepted Answer · 2018-08-22 03:37:22Z

0

Newer versions of JSON.stringify() have a replacer array

E.g.

```
JSON.stringify(foo, ['week', 'month']);  
// '{"week":45,"month":7}', only keep "week" and "month" properties
```

answered Aug 22, 2018 at 3:37

Michael Cole

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Comments

Aditya · Accepted Answer · 2018-08-22 04:46:31Z

0

Try with:

 if (key == "priv")

This should work.

answered Aug 22, 2018 at 4:46

Aditya

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