> For the complete documentation index, see [llms.txt](/llms.txt).
> A full single-fetch corpus is available at [llms-full.txt](/llms-full.txt).
---
title: "Preview deduplication"
description: "Preview which draft items would be removed by deduplication, without changing anything."
method: "POST"
endpoint: "/api/v1/projects/:projectId/datasets/:id/dedup/preview"
order: 13
group: "Deduplication"
last_verified: 2026-07-27
---



`POST /api/v1/projects/:projectId/datasets/:id/dedup/preview`

Preview which draft items would be removed by deduplication, without changing anything.


  #### Response
  ```json {{ title: 'Response' }}
  {
    "success": true,
    "message": "Preview generated",
    "data": {
      "dataset_id": "1a2b3c4d-...",
      "duplicate_count": 6,
      "scanned_count": 214,
      "duplicate_groups": [
        {
          "fingerprint": "b2c3d4e5f6...",
          "items": [
            { "id": "9a8b7c6d-...", "created_at": 1732636800000 },
            { "id": "8b7c6d5e-...", "created_at": 1740000000000 }
          ]
        }
      ]
    }
  }
  ```