# Website Asset & Script Extractor (`andok/asset-extractor`) Actor

Extract all CSS stylesheets and JavaScript files loaded on a webpage for technical SEO audits and performance optimization.

- **URL**: https://apify.com/andok/asset-extractor.md
- **Developed by:** [Andok](https://apify.com/andok) (community)
- **Categories:** Developer tools
- **Stats:** 16 total users, 1 monthly users, 100.0% runs succeeded, 0 bookmarks
- **User rating**: No ratings yet

## Pricing

from $1.00 / 1,000 page scanneds

This Actor is paid per event. You are not charged for the Apify platform usage, but only a fixed price for specific events.

Learn more: https://docs.apify.com/platform/actors/running/actors-in-store#pay-per-event

## What's an Apify Actor?

Actors are a software tools running on the Apify platform, for all kinds of web data extraction and automation use cases.
In Batch mode, an Actor accepts a well-defined JSON input, performs an action which can take anything from a few seconds to a few hours,
and optionally produces a well-defined JSON output, datasets with results, or files in key-value store.
In Standby mode, an Actor provides a web server which can be used as a website, API, or an MCP server.
Actors are written with capital "A".

## 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.
The best way to integrate Actors is as follows.

In JavaScript/TypeScript projects, use official [JavaScript/TypeScript client](https://docs.apify.com/api/client/js.md):

```bash
npm install apify-client
```

In Python projects, use official [Python client library](https://docs.apify.com/api/client/python.md):

```bash
pip install apify-client
```

In shell scripts, use [Apify CLI](https://docs.apify.com/cli/docs.md):

````bash
# MacOS / Linux
curl -fsSL https://apify.com/install-cli.sh | bash
# Windows
irm https://apify.com/install-cli.ps1 | iex
```bash

In AI frameworks, you might use the [Apify MCP server](https://docs.apify.com/platform/integrations/mcp.md).

If your project is in a different language, use the [REST API](https://docs.apify.com/api/v2.md).

For usage examples, see the [API](#api) section below.

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).


# README

## Web Page Asset Extractor

Extract all scripts, stylesheets, and external resources from any web page to understand exactly what gets loaded. Performance engineers use this to spot bloat, security teams use it to flag risky third-party includes, and archivists use it to inventory render-critical resources. Scan hundreds of pages in bulk with full cross-origin detection.

### Features

- **Script extraction** — finds every external `<script src="...">` and resolves it to an absolute URL
- **Stylesheet extraction** — captures all `<link rel="stylesheet">` references with full URL resolution
- **Cross-origin detection** — flags each asset as same-origin or cross-origin so you can spot third-party dependencies instantly
- **Deduplication** — automatically removes duplicate asset URLs within each page result
- **Bulk processing** — scan hundreds of URLs in a single run with configurable concurrency
- **Error resilience** — failed URLs still produce a result row with the error message, so no data goes missing
- **Pay-per-event billing** — you only pay for each page scanned, with automatic charge-limit enforcement

### Input

| Field | Type | Required | Default | Description |
|-------|------|----------|---------|-------------|
| `urls` | `array` | Yes | — | List of page URLs to scan for external assets. Each page is fetched and parsed for scripts and stylesheets. |
| `url` | `string` | No | — | Single URL to scan (for backwards compatibility). Use `urls` for bulk processing. |
| `timeoutSeconds` | `integer` | No | `15` | Maximum seconds to wait for each page response before timing out. |
| `concurrency` | `integer` | No | `10` | Number of pages to process in parallel. Increase for large batches, decrease if you hit rate limits. |

#### Input Example

```json
{
  "urls": [
    "https://crawlee.dev",
    "https://apify.com"
  ]
}
````

### Output

Each URL produces one dataset item listing all external scripts and stylesheets found on the page.

- `inputUrl` (`string`) — the URL you submitted
- `finalUrl` (`string`) — the URL after redirects
- `status` (`number`) — HTTP status code
- `cssCount` (`number`) — number of external stylesheets found
- `jsCount` (`number`) — number of external scripts found
- `stylesheets` (`array`) — list of stylesheet objects with `url` and `crossOrigin` fields
- `scripts` (`array`) — list of script objects with `url` and `crossOrigin` fields
- `error` (`string | null`) — error message if the URL could not be fetched
- `checkedAt` (`string`) — ISO 8601 timestamp of when the scan was performed

#### Output Example

```json
{
  "inputUrl": "https://crawlee.dev",
  "finalUrl": "https://crawlee.dev/",
  "status": 200,
  "cssCount": 2,
  "jsCount": 5,
  "stylesheets": [
    { "url": "https://crawlee.dev/assets/css/styles.css", "crossOrigin": false }
  ],
  "scripts": [
    { "url": "https://crawlee.dev/assets/js/main.js", "crossOrigin": false },
    { "url": "https://www.googletagmanager.com/gtag/js?id=G-XXXXX", "crossOrigin": true }
  ],
  "error": null,
  "checkedAt": "2025-01-15T10:30:00.000Z"
}
```

### Pricing

| Event | Cost |
|-------|------|
| Page Scanned | Pay-per-event (see actor pricing page) |

The actor stops automatically when the per-run charge limit is reached, so you never overspend.

### Use Cases

- **Performance auditing** — count external scripts and stylesheets to identify page-weight bloat
- **Security review** — flag cross-origin third-party scripts that could introduce supply-chain risk
- **Web archiving** — inventory every resource needed to fully render a page offline
- **Compliance checks** — detect unauthorized tracking scripts or ad-tech includes across your site
- **Competitor analysis** — see which CDNs, analytics tools, and widget vendors a competitor relies on

### Related Actors

| Actor | What it adds |
|-------|-------------|
| [Website Tech Stack Analyzer](https://apify.com/andok/tech-stack-analyzer) | Identifies the CMS, frameworks, and analytics behind each page — goes beyond raw asset URLs to named technologies |
| [Favicon & Brand Icon Extractor](https://apify.com/andok/favicon-extractor) | Extracts favicons and touch icons — complements asset extraction with brand imagery |
| [Security Headers Analyzer](https://apify.com/andok/security-headers-analyzer) | Audits HTTP security headers — pair with asset extraction for a full frontend security review |

# Actor input Schema

## `urls` (type: `array`):

List of page URLs to scan for external scripts and stylesheets. Each page is fetched and parsed for asset references.

## `url` (type: `string`):

Single URL to scan (for backwards compatibility). Use the URLs field above for bulk processing.

## `timeoutSeconds` (type: `integer`):

Maximum seconds to wait for each page response. Increase for slow or geographically distant sites.

## `concurrency` (type: `integer`):

Number of pages to process in parallel. Higher values speed up large batches but may trigger rate limits on some hosts.

## Actor input object example

```json
{
  "urls": [
    "https://crawlee.dev"
  ],
  "timeoutSeconds": 15,
  "concurrency": 10
}
```

# Actor output Schema

## `results` (type: `string`):

No description

## `resultsCsv` (type: `string`):

No description

## `run` (type: `string`):

No description

# API

You can run this Actor programmatically using our API. Below are code examples in JavaScript, Python, and CLI, as well as the OpenAPI specification and MCP server setup.

## JavaScript example

```javascript
import { ApifyClient } from 'apify-client';

// Initialize the ApifyClient with your Apify API token
// Replace the '<YOUR_API_TOKEN>' with your token
const client = new ApifyClient({
    token: '<YOUR_API_TOKEN>',
});

// Prepare Actor input
const input = {
    "urls": [
        "https://crawlee.dev"
    ]
};

// Run the Actor and wait for it to finish
const run = await client.actor("andok/asset-extractor").call(input);

// Fetch and print Actor results from the run's dataset (if any)
console.log('Results from dataset');
console.log(`💾 Check your data here: https://console.apify.com/storage/datasets/${run.defaultDatasetId}`);
const { items } = await client.dataset(run.defaultDatasetId).listItems();
items.forEach((item) => {
    console.dir(item);
});

// 📚 Want to learn more 📖? Go to → https://docs.apify.com/api/client/js/docs

```

## Python example

```python
from apify_client import ApifyClient

# Initialize the ApifyClient with your Apify API token
# Replace '<YOUR_API_TOKEN>' with your token.
client = ApifyClient("<YOUR_API_TOKEN>")

# Prepare the Actor input
run_input = { "urls": ["https://crawlee.dev"] }

# Run the Actor and wait for it to finish
run = client.actor("andok/asset-extractor").call(run_input=run_input)

# Fetch and print Actor results from the run's dataset (if there are any)
print("💾 Check your data here: https://console.apify.com/storage/datasets/" + run["defaultDatasetId"])
for item in client.dataset(run["defaultDatasetId"]).iterate_items():
    print(item)

# 📚 Want to learn more 📖? Go to → https://docs.apify.com/api/client/python/docs/quick-start

```

## CLI example

```bash
echo '{
  "urls": [
    "https://crawlee.dev"
  ]
}' |
apify call andok/asset-extractor --silent --output-dataset

```

## MCP server setup

```json
{
    "mcpServers": {
        "apify": {
            "command": "npx",
            "args": [
                "mcp-remote",
                "https://mcp.apify.com/?tools=andok/asset-extractor",
                "--header",
                "Authorization: Bearer <YOUR_API_TOKEN>"
            ]
        }
    }
}

```

## OpenAPI specification

```json
{
    "openapi": "3.0.1",
    "info": {
        "title": "Website Asset & Script Extractor",
        "description": "Extract all CSS stylesheets and JavaScript files loaded on a webpage for technical SEO audits and performance optimization.",
        "version": "1.0",
        "x-build-id": "Y4DRf5Ru1JZ1y3ytN"
    },
    "servers": [
        {
            "url": "https://api.apify.com/v2"
        }
    ],
    "paths": {
        "/acts/andok~asset-extractor/run-sync-get-dataset-items": {
            "post": {
                "operationId": "run-sync-get-dataset-items-andok-asset-extractor",
                "x-openai-isConsequential": false,
                "summary": "Executes an Actor, waits for its completion, and returns Actor's dataset items in response.",
                "tags": [
                    "Run Actor"
                ],
                "requestBody": {
                    "required": true,
                    "content": {
                        "application/json": {
                            "schema": {
                                "$ref": "#/components/schemas/inputSchema"
                            }
                        }
                    }
                },
                "parameters": [
                    {
                        "name": "token",
                        "in": "query",
                        "required": true,
                        "schema": {
                            "type": "string"
                        },
                        "description": "Enter your Apify token here"
                    }
                ],
                "responses": {
                    "200": {
                        "description": "OK"
                    }
                }
            }
        },
        "/acts/andok~asset-extractor/runs": {
            "post": {
                "operationId": "runs-sync-andok-asset-extractor",
                "x-openai-isConsequential": false,
                "summary": "Executes an Actor and returns information about the initiated run in response.",
                "tags": [
                    "Run Actor"
                ],
                "requestBody": {
                    "required": true,
                    "content": {
                        "application/json": {
                            "schema": {
                                "$ref": "#/components/schemas/inputSchema"
                            }
                        }
                    }
                },
                "parameters": [
                    {
                        "name": "token",
                        "in": "query",
                        "required": true,
                        "schema": {
                            "type": "string"
                        },
                        "description": "Enter your Apify token here"
                    }
                ],
                "responses": {
                    "200": {
                        "description": "OK",
                        "content": {
                            "application/json": {
                                "schema": {
                                    "$ref": "#/components/schemas/runsResponseSchema"
                                }
                            }
                        }
                    }
                }
            }
        },
        "/acts/andok~asset-extractor/run-sync": {
            "post": {
                "operationId": "run-sync-andok-asset-extractor",
                "x-openai-isConsequential": false,
                "summary": "Executes an Actor, waits for completion, and returns the OUTPUT from Key-value store in response.",
                "tags": [
                    "Run Actor"
                ],
                "requestBody": {
                    "required": true,
                    "content": {
                        "application/json": {
                            "schema": {
                                "$ref": "#/components/schemas/inputSchema"
                            }
                        }
                    }
                },
                "parameters": [
                    {
                        "name": "token",
                        "in": "query",
                        "required": true,
                        "schema": {
                            "type": "string"
                        },
                        "description": "Enter your Apify token here"
                    }
                ],
                "responses": {
                    "200": {
                        "description": "OK"
                    }
                }
            }
        }
    },
    "components": {
        "schemas": {
            "inputSchema": {
                "type": "object",
                "properties": {
                    "urls": {
                        "title": "URLs",
                        "minItems": 1,
                        "type": "array",
                        "description": "List of page URLs to scan for external scripts and stylesheets. Each page is fetched and parsed for asset references.",
                        "items": {
                            "type": "string"
                        }
                    },
                    "url": {
                        "title": "Single URL",
                        "type": "string",
                        "description": "Single URL to scan (for backwards compatibility). Use the URLs field above for bulk processing."
                    },
                    "timeoutSeconds": {
                        "title": "Timeout (seconds)",
                        "minimum": 1,
                        "maximum": 120,
                        "type": "integer",
                        "description": "Maximum seconds to wait for each page response. Increase for slow or geographically distant sites.",
                        "default": 15
                    },
                    "concurrency": {
                        "title": "Concurrency",
                        "minimum": 1,
                        "maximum": 50,
                        "type": "integer",
                        "description": "Number of pages to process in parallel. Higher values speed up large batches but may trigger rate limits on some hosts.",
                        "default": 10
                    }
                }
            },
            "runsResponseSchema": {
                "type": "object",
                "properties": {
                    "data": {
                        "type": "object",
                        "properties": {
                            "id": {
                                "type": "string"
                            },
                            "actId": {
                                "type": "string"
                            },
                            "userId": {
                                "type": "string"
                            },
                            "startedAt": {
                                "type": "string",
                                "format": "date-time",
                                "example": "2025-01-08T00:00:00.000Z"
                            },
                            "finishedAt": {
                                "type": "string",
                                "format": "date-time",
                                "example": "2025-01-08T00:00:00.000Z"
                            },
                            "status": {
                                "type": "string",
                                "example": "READY"
                            },
                            "meta": {
                                "type": "object",
                                "properties": {
                                    "origin": {
                                        "type": "string",
                                        "example": "API"
                                    },
                                    "userAgent": {
                                        "type": "string"
                                    }
                                }
                            },
                            "stats": {
                                "type": "object",
                                "properties": {
                                    "inputBodyLen": {
                                        "type": "integer",
                                        "example": 2000
                                    },
                                    "rebootCount": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "restartCount": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "resurrectCount": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "computeUnits": {
                                        "type": "integer",
                                        "example": 0
                                    }
                                }
                            },
                            "options": {
                                "type": "object",
                                "properties": {
                                    "build": {
                                        "type": "string",
                                        "example": "latest"
                                    },
                                    "timeoutSecs": {
                                        "type": "integer",
                                        "example": 300
                                    },
                                    "memoryMbytes": {
                                        "type": "integer",
                                        "example": 1024
                                    },
                                    "diskMbytes": {
                                        "type": "integer",
                                        "example": 2048
                                    }
                                }
                            },
                            "buildId": {
                                "type": "string"
                            },
                            "defaultKeyValueStoreId": {
                                "type": "string"
                            },
                            "defaultDatasetId": {
                                "type": "string"
                            },
                            "defaultRequestQueueId": {
                                "type": "string"
                            },
                            "buildNumber": {
                                "type": "string",
                                "example": "1.0.0"
                            },
                            "containerUrl": {
                                "type": "string"
                            },
                            "usage": {
                                "type": "object",
                                "properties": {
                                    "ACTOR_COMPUTE_UNITS": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "DATASET_READS": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "DATASET_WRITES": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "KEY_VALUE_STORE_READS": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "KEY_VALUE_STORE_WRITES": {
                                        "type": "integer",
                                        "example": 1
                                    },
                                    "KEY_VALUE_STORE_LISTS": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "REQUEST_QUEUE_READS": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "REQUEST_QUEUE_WRITES": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "DATA_TRANSFER_INTERNAL_GBYTES": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "DATA_TRANSFER_EXTERNAL_GBYTES": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "PROXY_RESIDENTIAL_TRANSFER_GBYTES": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "PROXY_SERPS": {
                                        "type": "integer",
                                        "example": 0
                                    }
                                }
                            },
                            "usageTotalUsd": {
                                "type": "number",
                                "example": 0.00005
                            },
                            "usageUsd": {
                                "type": "object",
                                "properties": {
                                    "ACTOR_COMPUTE_UNITS": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "DATASET_READS": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "DATASET_WRITES": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "KEY_VALUE_STORE_READS": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "KEY_VALUE_STORE_WRITES": {
                                        "type": "number",
                                        "example": 0.00005
                                    },
                                    "KEY_VALUE_STORE_LISTS": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "REQUEST_QUEUE_READS": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "REQUEST_QUEUE_WRITES": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "DATA_TRANSFER_INTERNAL_GBYTES": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "DATA_TRANSFER_EXTERNAL_GBYTES": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "PROXY_RESIDENTIAL_TRANSFER_GBYTES": {
                                        "type": "integer",
                                        "example": 0
                                    },
                                    "PROXY_SERPS": {
                                        "type": "integer",
                                        "example": 0
                                    }
                                }
                            }
                        }
                    }
                }
            }
        }
    }
}
```