Configuration

codeceptjs init creates a codecept.conf.js (or codecept.conf.ts) in your test root. It exports a config object:

export const config = {
  tests: './**/*_test.js',
  output: './output',
  helpers: {
    Playwright: { url: 'http://localhost', browser: 'chromium' },
  },
  include: {
    I: './steps_file.js',
  },
}

Options

Tests and files

• tests — glob pattern (or array of patterns) locating your test files, e.g. 'tests/**/*_test.js' (or *_test.ts for TypeScript).
• output — directory for failure screenshots, artifacts, and temporary files. Default ./output.
• include — page objects and support objects exposed via dependency injection: { I: './steps_file.js', loginPage: './pages/Login.js' }. They can then be injected by name — Scenario('test', ({ I, loginPage }) => …).
• require — extra modules to load before tests run: assertion libraries, TypeScript loaders, setup files. See Require.
• grep — run only tests whose name matches this pattern, e.g. grep: '@firefox'. Handy when you keep separate configs per environment.

Helpers and plugins

• helpers — enable and configure helpers: { Playwright: { url: 'https://mysite.com', browser: 'firefox' } }.
• plugins — enable plugins: { autoDelay: { enabled: true } }.

Hooks

• bootstrap / teardown — run code before / after the whole run; an async function or a path to a JS module. See Bootstrap.
• bootstrapAll / teardownAll — run once around a parallel run (before any worker starts / after all finish). See bootstrapAll / teardownAll.

Test runner

• timeout — default per-test timeout in seconds; a test is killed if it stops responding.
• mocha — Mocha options, including extra reporters. See Reporters.

BDD

• gherkin — enable BDD features: { features: './features/*.feature', steps: ['./step_definitions/steps.js'] }.
  • gherkin.features — feature file glob, or an array of globs.
  • gherkin.steps — JS files with step definitions.

TypeScript

• fullPromiseBased — generate typings where I.* methods return promises, so you can await each command. See TypeScript.

Other

• translation — enable localized commands.
• maskSensitiveData — mask secrets in console output.
• noGlobals — don't register the global functions (Feature, Scenario, Before, …). Not recommended.

Require

require loads modules before tests run — assertion libraries ('should'), setup files ('./lib/setup'), and TypeScript loaders. Modules load in the order listed.

For TypeScript test files in CodeceptJS 4.x, use the tsx loader:

// codecept.conf.ts
export const config = {
  tests: './**/*_test.ts',
  require: ['tsx/cjs'],
  helpers: {},
  include: {},
}

Combine several modules:

require: ['tsx/cjs', 'should', './lib/testSetup']

The config file itself (codecept.conf.ts) and helpers are transpiled automatically — only test files need the loader. See TypeScript for the full setup.

Dynamic configuration

A JS/TS config file is plain code, so you can read environment variables and build the config at runtime:

export const config = {
  helpers: {
    WebDriver: {
      url: process.env.CODECEPT_URL || 'http://localhost:3000',
      user: process.env.CLOUDSERVICE_USER,
      key: process.env.CLOUDSERVICE_KEY,
      waitForTimeout: 10000,
    },
  },
  include: {
    I: './src/steps_file.js',
    loginPage: './src/pages/login_page.js',
  },
}

Override config values at runtime with --override / -o, passing JSON:

npx codeceptjs run -o '{ "helpers": { "WebDriver": { "browser": "firefox" } } }'

Point at a non-default config file with --config / -c:

npx codeceptjs run --config ./path/to/config.js

Common configuration patterns

@codeceptjs/configure ships with CodeceptJS as a dependency. It holds shared recipes for config that's independent of the active helper.

Toggle headless mode, set window size, and so on:

import { setHeadlessWhen, setWindowSize } from '@codeceptjs/configure'

setHeadlessWhen(process.env.HEADLESS || process.env.CI)
setWindowSize(1600, 1200)

export const config = {
  // ...
}

For one-shot bundles use setBrowserConfig — pass any subset of { browser, show, windowSize, url } and the right per-helper translation happens automatically (Puppeteer gets product, WebDriver gets --headless injected, …). Keys whose value is undefined are skipped, so an unset env var won't clobber existing config:

import { setBrowserConfig } from '@codeceptjs/configure'

setBrowserConfig({
  browser: process.env.BROWSER,     // optional engine override
  show: !process.env.HEADLESS,      // headed unless HEADLESS is set
  windowSize: '1280x720',
  url: process.env.URL,             // overrides helper.url when set
})

setCommonPlugins() enables a curated set of plugins and registers a few more as discoverable, so they can be switched on ad-hoc with -p plugin arguments without editing the config:

import { setCommonPlugins } from '@codeceptjs/configure'

setCommonPlugins()

• retryFailedStep — enabled. Retries steps that fail with transient errors.
• screenshot — enabled. Screenshot on fail (default), or test / step / file / url.
• pause — registered. Pause on failure / step / file / URL: -p pause:on=fail, -p pause:on=step, -p pause:on=file:path=tests/login_test.js, -p pause:on=url:pattern=/checkout/*.
• browser — registered. CLI overrides for browser helpers: -p browser:show, -p browser:browser=firefox. See browser control.
• aiTrace — registered. Capture AI traces: -p aiTrace, narrow with on=fail|test|step|file|url.
• heal — registered. Self-heal failing steps: -p heal, narrow with on=file|url.

eachElement, tryTo, and retryTo are no longer plugins in 4.x — import them from codeceptjs/effects.

Profile

process.env.profile carries the value of the --profile CLI option, so you can branch the config on it:

npx codeceptjs run --profile firefox

export const config = {
  helpers: {
    WebDriver: {
      url: 'http://localhost:3000',
      browser: process.env.profile || 'chrome',
    },
  },
}