# Check Shopify CSV blank overwrites and variant changes

**Use case:** 

Compare two synthetic Shopify product CSVs before an overwrite import. See three findings: a blank Vendor overwrite, changed variant options and a variant recreation risk. Download HTML, CSV and JSON reports; extra image rows are handled separately from variants.

## Input

```json
{
  "mode": "shopify",
  "columnPreset": "standard",
  "shopifyOverwriteExisting": true,
  "oldCsv": "Handle,Title,Vendor,Option1 Name,Option1 Value,Variant SKU,Variant Price,Variant Inventory Qty,Image Src\ntrail-mug,Trail Mug,Northwind Goods,Color,Blue,MUG-BLUE,12.50,12,https://example.com/synthetic-mug.jpg\ntrail-mug,,,Color,Green,MUG-GREEN,12.50,8,\ntrail-mug,,,,,,,,https://example.com/synthetic-mug-back.jpg\n",
  "newCsv": "Handle,Title,Vendor,Option1 Name,Option1 Value,Variant SKU,Variant Price,Variant Inventory Qty,Image Src\ntrail-mug,Trail Mug,,Color,Azure,MUG-BLUE,12.50,12,https://example.com/synthetic-mug.jpg\ntrail-mug,,,Color,Green,MUG-GREEN,12.50,8,\ntrail-mug,,,,,,,,https://example.com/synthetic-mug-back.jpg\n",
  "priceChangePercent": 20
}
```

## Output

```json
{
  "mode": {
    "label": "Mode",
    "format": "string"
  },
  "overwriteExisting": {
    "label": "Overwrite existing",
    "format": "boolean"
  },
  "oldHandles": {
    "label": "Old handles",
    "format": "integer"
  },
  "newHandles": {
    "label": "New handles",
    "format": "integer"
  },
  "matchedVariants": {
    "label": "Matched variants",
    "format": "integer"
  },
  "handlesNotInImport": {
    "label": "Handles not in import",
    "format": "integer"
  },
  "excludedFromComparison": {
    "label": "Excluded from comparison",
    "format": "integer"
  },
  "scope": {
    "label": "Scope",
    "format": "string"
  }
}
```

## About this Actor

This example demonstrates how to use [Supplier CSV & Shopify Import Checker](https://apify.com/fluffy_ingot/supplier-catalog-preflight.md) with a specific input configuration. Visit the [Actor detail page](https://apify.com/fluffy_ingot/supplier-catalog-preflight.md) to learn more, explore other use cases, and run it yourself.


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This Task's input is already configured above — use it as-is rather than inventing a new one.

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For full API examples (JavaScript, Python, CLI, MCP, OpenAPI), see this Task's Actor page: https://apify.com/fluffy_ingot/supplier-catalog-preflight.md

For more details, see Apify documentation as [Markdown index](https://docs.apify.com/llms.txt) and [Markdown full-text](https://docs.apify.com/llms-full.txt).