# Product Catalog Diff: Find New SKUs Only

**Use case:** 

Filter a daily product scrape against a master catalog so only new SKUs are output. Built for e-commerce analysts who alert on new listings, not reruns.

## Input

```json
{
  "datasetIds": [
    "7ykL2QpRt3NmXaBc9"
  ],
  "fields": [
    "sku",
    "url"
  ],
  "output": "unique-items",
  "mode": "dedup-after-load",
  "nullAsUnique": false,
  "datasetIdsOfFilterItems": [
    "mQ4vTz8WsE1JdRnK0"
  ],
  "postDedupTransformFunction": "[{'sku': i.get('sku'), 'name': i.get('name'), 'price': i.get('price'), 'url': i.get('url')} for i in items]",
  "outputTo": "dataset",
  "outputDatasetId": "new-products-today",
  "appendDatasetIds": false,
  "fieldsToLoad": [
    "sku",
    "url",
    "name",
    "price"
  ],
  "batchSizeLoad": 50000,
  "uploadBatchSize": 500,
  "parallelLoads": 10,
  "parallelPushes": 5,
  "verboseLog": false
}
```

## Output

```json
{
  "__datasetId__": {
    "label": "Source Dataset",
    "format": "string"
  }
}
```

## About this Actor

This example demonstrates how to use [Deduplicate, Merge & Transform Datasets](https://apify.com/datacach/deduplicate-datasets) with a specific input configuration. Visit the [Actor detail page](https://apify.com/datacach/deduplicate-datasets) to learn more, explore other use cases, and run it yourself.