# Find Leads Not Yet in Your CRM (Left Anti Join)

**Use case:** 

Return only the rows in list A that have no match in list B by email or ID: new leads not in your CRM, products you don't stock, contacts who haven't replied.

## Input

```json
{
  "leftData": [
    {
      "email": "ana@example.com",
      "company": "Silva Ltd"
    },
    {
      "email": "ben@example.com",
      "company": "Okafor & Co"
    },
    {
      "email": "cara@example.com",
      "company": "Lind Studio"
    },
    {
      "email": "dev@example.com",
      "company": "Patel Group"
    },
    {
      "email": "erin@example.com",
      "company": "Erin Design"
    }
  ],
  "rightData": [
    {
      "email": "ANA@example.com"
    },
    {
      "email": "dev@example.com"
    }
  ],
  "leftKeyFields": [
    "email"
  ],
  "joinType": "leftAnti",
  "keyMatching": "normalized",
  "onFieldConflict": "prefixRight",
  "rightFieldPrefix": "right_",
  "multipleMatches": "all",
  "includeJoinInfo": true,
  "exportFormats": [],
  "maxItems": 0
}
```

## Output

```json
{
  "_joinStatus": {
    "label": "Join status",
    "format": "text"
  },
  "_matchCount": {
    "label": "Matches",
    "format": "number"
  },
  "email": {
    "label": "Email",
    "format": "text"
  },
  "name": {
    "label": "Name",
    "format": "text"
  },
  "company": {
    "label": "Company",
    "format": "text"
  },
  "plan": {
    "label": "Plan",
    "format": "text"
  },
  "mrr": {
    "label": "MRR",
    "format": "number"
  }
}
```

## About this Actor

This example demonstrates how to use [Dataset Join & Merge (VLOOKUP for Datasets)](https://apify.com/nerolabs/dataset-join-merge) with a specific input configuration. Visit the [Actor detail page](https://apify.com/nerolabs/dataset-join-merge) to learn more, explore other use cases, and run it yourself.


## How to integrate an Actor?

If asked about integration, you help developers integrate Actors into their projects.
You adapt to their stack and deliver integrations that are safe, well-documented, and production-ready.
This Task's input is already configured above — use it as-is rather than inventing a new one.

- **AI agents and MCP clients** — the [Apify MCP server](https://docs.apify.com/integrations/mcp.md) at `https://mcp.apify.com` (remote, streamable HTTP, OAuth on first use).
- **Agentic workflows and local Actor development** — [Agent Skills](https://apify.com/.well-known/agent-skills/index.json) with the [Apify CLI](https://docs.apify.com/cli/docs.md): `npm install -g apify-cli`, then `apify login`.
- **JavaScript/TypeScript projects** — the official [JS/TS client](https://docs.apify.com/api/client/js/docs.md): `npm install apify-client`.
- **Python projects** — the official [Python client](https://docs.apify.com/api/client/python/docs.md): `pip install apify-client`.
- **Any other language** — the [REST API](https://docs.apify.com/api/v2.md).

For full API examples (JavaScript, Python, CLI, MCP, OpenAPI), see this Task's Actor page: https://apify.com/nerolabs/dataset-join-merge.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).