# Core Web Vitals Test – LCP, INP & CLS Pass/Fail per Page

**Use case:** 

See which pages pass Google's Core Web Vitals for real users (LCP, INP, CLS from the Chrome UX Report), with lab scores and the fixes that matter most. Paste your key pages and compare.

## Input

```json
{
  "urls": [
    "https://www.shopify.com/",
    "https://www.wix.com/",
    "https://wordpress.com/",
    "https://www.squarespace.com/"
  ],
  "device": "mobile"
}
```

## Output

```json
{
  "url": {
    "label": "Page",
    "format": "string"
  },
  "device": {
    "label": "Device",
    "format": "string"
  },
  "performance_score": {
    "label": "Performance",
    "format": "number"
  },
  "accessibility_score": {
    "label": "Accessibility",
    "format": "number"
  },
  "best_practices_score": {
    "label": "Best practices",
    "format": "number"
  },
  "seo_score": {
    "label": "SEO",
    "format": "number"
  },
  "lcp_ms": {
    "label": "LCP (ms, lab)",
    "format": "number"
  },
  "cls": {
    "label": "CLS (lab)",
    "format": "number"
  },
  "tbt_ms": {
    "label": "TBT (ms)",
    "format": "number"
  },
  "field_lcp_ms": {
    "label": "LCP (ms, real users)",
    "format": "number"
  },
  "field_inp_ms": {
    "label": "INP (ms, real users)",
    "format": "number"
  },
  "passes_core_web_vitals": {
    "label": "Passes CWV",
    "format": "boolean"
  },
  "error": {
    "label": "Error",
    "format": "string"
  }
}
```

## How it works

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

The PageSpeed Insights API – Website Speed Test & Core Web Vitals Actor is ready to run with the inputs already set for "Core Web Vitals Test – LCP, INP & CLS Pass/Fail per Page". [Sign up or log in](https://console.apify.com/create-task-from-example/Sfvb9FiFPDdlhyNh0) and you'll land in Apify Console with a copy of this exact task.

### 2. Start the "Core Web Vitals Test – LCP, INP & CLS Pass/Fail per Page" task

The PageSpeed Insights API – Website Speed Test & Core Web Vitals Actor will start running based on the input automatically. You can also change all the input fields, like pages to test and device, to match your specific use case.

### 3. Receive the "Core Web Vitals Test – LCP, INP & CLS Pass/Fail per Page" 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, device, performance, 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 "Core Web Vitals Test – LCP, INP & CLS Pass/Fail per Page" task via API](https://apify.com/rowfeed/pagespeed-insights-api.md).

## About this Actor

This example demonstrates how to use [PageSpeed Insights API – Website Speed Test & Core Web Vitals](https://apify.com/rowfeed/pagespeed-insights-api.md) with a specific input configuration. Visit the [Actor detail page](https://apify.com/rowfeed/pagespeed-insights-api.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/rowfeed/pagespeed-insights-api.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`).