To remove string duplicates from an array in Node.js, you can use the `filter` method along with the `indexOf` method.

Here's an example:

const array = ['foo', 'bar', 'baz', 'foo', 'qux', 'bar'];

const uniqueArray = array.filter((item, index) => {
  return array.indexOf(item) === index;
});

console.log(uniqueArray);
// Output: ['foo', 'bar', 'baz', 'qux']

In the above example, the `filter` method loops through each item in the `array` and passes it to a callback function. The `indexOf` method is then used to check if the current item is the first occurrence of that item in the array. If it is, the item is added to a new array called `uniqueArray`. If it's not the first occurrence, it's filtered out of the array.

After this process, `uniqueArray` will contain only the unique strings from the original `array`.