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.
Learn more about Checkly runtimes in our Runtimes documentation.

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Usage

List all available runtimes with their dependency versions.
Terminal
npx checkly runtimes
Example output:
Terminal
[
  {
    "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

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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

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Package Availability

Common packages included in Checkly runtimes:
  • HTTP clients: axios
  • Utilities: lodash, moment, date-fns
  • Testing: expect
  • Cryptography: crypto-js, jsonwebtoken
  • Environment: dotenv

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Configuration

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Setting Runtime in Configuration

Specify a runtime version in your checkly.config.ts:
checkly.config.ts
import { defineConfig } from 'checkly'

export default defineConfig({
  projectName: 'My Project',
  checks: {
    runtimeId: '2025.04',
  }
  /* More options... */
})
Or in your runtime-dependent checks:
apicheck.ts
import { ApiCheck } from 'checkly/constructs'

new ApiCheck('books-api-check-2', {
  name: 'Books API',
  runtimeId: '2025.04',
  /* More options... */
Or in your check groups:
checkgroup.check.ts
import { CheckGroupV2 } from 'checkly/constructs'

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

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

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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 for runtime update announcements.