> ## Documentation Index
> Fetch the complete documentation index at: https://checklyhq.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# checkly runtimes

> List all available runtimes and their dependencies.

The `checkly runtimes` command displays all available runtime environments and their installed dependencies. This helps you understand what packages and versions are available for your checks in the Checkly cloud infrastructure.

<Tip>Learn more about Checkly runtimes in our [Runtimes documentation](/platform/runtimes/overview).</Tip>

## Usage

List all available runtimes with their dependency versions.

```bash Terminal theme={null}
npx checkly runtimes
```

Example output:

```bash Terminal theme={null}
[
  {
    "name": "2025.04",
    "description": "The main update is Playwright 1.51.1. The Node.js version is v22.11.0.",
    "stage": "CURRENT",
    "dependencies": {
      "@playwright/test": "1.51.1",
      "@axe-core/playwright": "4.10.1",
      "@azure/identity": "4.9.1",
      "@azure/keyvault-secrets": "4.9.0",
      "@checkly/playwright-helpers": "1.0.3"
      ...
      ...
```

## Runtime Information

### Runtime Versions

Each runtime environment includes:

* **Runtime name** (e.g., `2025.04`)
* **Description** and release information (highlights and Node.js version)
* **Playwright version** for browser automation
* **Built-in packages** and their versions

### Package Availability

Common packages included in Checkly runtimes:

* **HTTP clients**: axios
* **Utilities**: lodash, moment, date-fns
* **Testing**: expect
* **Cryptography**: crypto-js, jsonwebtoken
* **Environment**: dotenv

## Configuration

### Setting Runtime in Configuration

Specify a runtime version in your `checkly.config.ts`:

```typescript checkly.config.ts highlight={6} theme={null}
import { defineConfig } from 'checkly'

export default defineConfig({
  projectName: 'My Project',
  checks: {
    runtimeId: '2025.04',
  }
  /* More options... */
})
```

Or in your runtime-dependent checks:

```typescript apicheck.ts highlight={5} theme={null}
import { ApiCheck } from 'checkly/constructs'

new ApiCheck('books-api-check-2', {
  name: 'Books API',
  runtimeId: '2025.04',
  /* More options... */
```

Or in your check groups:

```typescript checkgroup.check.ts highlight={5} theme={null}
import { CheckGroupV2 } from 'checkly/constructs'

const syntheticGroup = new CheckGroupV2('check-group-synthetics', {
  name: 'Synthetic Monitors Group',
  runtimeId: '2025.04',
  /* More options... */
})
```

### Runtime Compatibility

When selecting a runtime, consider:

* **Package versions** your code depends on
* **Node.js features** you're using
* **Playwright compatibility** for browser checks
* **Long-term support** for production environments

<Tip>Use the latest runtime for new projects to benefit from the newest features and security updates.</Tip>

## Runtime Updates

Checkly regularly updates runtimes with:

* **Security patches** for Node.js and dependencies
* **New package versions** and additional utilities
* **Performance improvements** and bug fixes
* **Extended browser support** via Playwright updates

Check the [Checkly changelog](https://feedback.checklyhq.com/changelog) for runtime update announcements.

## Related Commands

* [`checkly test`](/cli/checkly-test) - Test checks with current runtime
* [`checkly deploy`](/cli/checkly-deploy) - Deploy checks to specified runtime