# Flatten a website crawler's nested JSON results into a CSV

**Use case:** 

Flatten a crawler's nested JSON results into one clean row per page and save them as a CSV. Pages that failed are dropped, duplicates removed by canonical URL, and only title, description and language kept, without the bulky text and markdown columns. The sample rows are shaped like Website Content Crawler output; pick your own crawler run's dataset instead.

## Input

```json
{
  "datasetId": "yiLNIODlBwmSbgLln",
  "fileUrl": "https://api.fiscaldata.treasury.gov/services/api/fiscal_service/v1/accounting/od/rates_of_exchange?format=csv&filter=record_date:eq:2025-12-31&page[size]=300",
  "filters": [
    "crawl.httpStatusCode == 200"
  ],
  "filterMode": "all",
  "dedupeBy": [
    "metadata.canonicalUrl"
  ],
  "sortBy": [
    "exchange_rate"
  ],
  "fields": [
    "url",
    "metadata.title -> pageTitle",
    "metadata.description -> description",
    "metadata.languageCode -> language"
  ],
  "flatten": true,
  "exportFormat": "csv",
  "csvFormulaSafe": true,
  "fileFormat": "auto"
}
```

## Output

```json
{
  "url": {
    "label": "Page",
    "format": "link"
  },
  "pageTitle": {
    "label": "Title",
    "format": "text"
  },
  "description": {
    "label": "Description",
    "format": "text"
  },
  "language": {
    "label": "Language",
    "format": "text"
  }
}
```

## How it works

### 1. Sign up on Apify or log in

The Dataset Transformer: Filter, Dedupe, JSON to CSV Actor is ready to run with the inputs already set for "Flatten a website crawler's nested JSON results into a CSV". [Sign up or log in](https://console.apify.com/create-task-from-example/LQYnvdftMe6sOeDzA) and you'll land in Apify Console with a copy of this exact task.

### 2. Start the "Flatten a website crawler's nested JSON results into a CSV" task

The Dataset Transformer: Filter, Dedupe, JSON to CSV Actor will start running based on the input automatically. You can also change all the input fields, like apify dataset, or: file url or upload (csv, json, jsonl or excel), and more, to match your specific use case.

### 3. Receive the "Flatten a website crawler's nested JSON results into a CSV" output

Monitor the progress in real time. You will be notified as soon as your dataset is complete and ready for review. Each result includes data such as page, title, description, and more.

### 4. Integrate into your workflow

The final output is delivered in JSON, CSV, or Excel format, ready to be plugged into your workflow. You can also [run the "Flatten a website crawler's nested JSON results into a CSV" task via API](https://apify.com/humble-echidna/dataset-transform.md).

## About this Actor

This example demonstrates how to use [Dataset Transformer: Filter, Dedupe, JSON to CSV](https://apify.com/humble-echidna/dataset-transform.md) with a specific input configuration. Visit the [Actor detail page](https://apify.com/humble-echidna/dataset-transform.md) to learn more, explore other use cases, and run it yourself.


## How to integrate an Actor?

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

Do not guess an integration path. Every one of them is in the agent quickstart at https://apify.com/agents.md: the Apify MCP server, Agent Skills with the Apify CLI, the JavaScript and Python clients, the REST API, and the account-free path for an agent with no human to sign in. It also carries the rule on stating cost before the first paid run.

For full API examples (JavaScript, Python, CLI, MCP, OpenAPI), see this Task's Actor page: https://apify.com/humble-echidna/dataset-transform.md

Each client library has reference documentation the quickstart does not restate: [JavaScript/TypeScript](https://docs.apify.com/api/client/js/docs.md) (`npm install apify-client`) and [Python](https://docs.apify.com/api/client/python/docs.md) (`pip install apify-client`).