Codeceptjs Auth

CodeceptJS Auth Plugin

The auth plugin logs each user in once, captures cookies (or localStorage/token via overrides), and restores the session for subsequent tests. Stale sessions trigger a fresh login automatically.

If the project already has auth configured (fundamentals' discovery output), reuse its existing inject name and user keys — don't reconfigure.

Decide first — ask the user

Four answers shape the plugin. Don't guess any.

1. Is a session needed at all? Public flows (landing, signup) → skip the plugin.
2. One user or many? Default one; add more only when actually exercised.
3. If many — what splits them? Role, workspace/tenant, plan tier, sign-in provider, per-test fixture — real systems vary. Ask; use the answer to name users.<key> entries.
4. What's the auth type?
   • Form — default; canonical shape below
   • OAuth / SSO — click provider button, drive the IdP page (often separate origin)
   • Magic link / passwordless — UI flow rarely worth automating; prefer an API mint or reading the link from a test mailbox
   • API token — skip the form; write the token into localStorage via executeScript, or I.setCookie(...)
   • 2FA / OTP — async login; fetch the code from a test mailbox / backdoor before submitting

Rules

1. Login flow never lives in the conf. Put it in steps_file.js (if included) or a page object; conf only references it: login: (I) => I.login().
2. Credentials from env only — .env loaded via process.loadEnvFile() (no dotenv dependency). Passwords wrapped with secret(...). No literals anywhere — conf, steps file, test, git history.
3. .env is gitignored; .env.example is committed with names, no values. Gitignore output/*_session.json too.

Canonical shape

// codecept.conf.js — first line of the file
process.loadEnvFile()

export const config = {
  include: { I: './steps_file.js' },
  plugins: {
    auth: {
      enabled: true,
      saveToFile: true,
      users: {
        admin: {
          login: (I) => I.login(),
          check: (I) => I.see('Welcome, User', '.navbar'),
        },
      },
    },
  },
}

// steps_file.js
import { secret } from 'codeceptjs'
const { I } = inject()

export default function () {
  return actor({
    login() {
      I.amOnPage('/login')
      I.fillField('Email', process.env.ADMIN_EMAIL)
      I.fillField('Password', secret(process.env.ADMIN_PASSWORD))
      I.click('Sign in')
    },
  })
}

# .env (gitignored)        # .env.example (committed)
USER_EMAIL=...             USER_EMAIL=
USER_PASSWORD=<secret>     USER_PASSWORD=

Pre-flight (before writing config)

1. Read the real login page — MCP run_code to /login, inspect the ARIA snapshot (codeceptjs-exploration). Field labels / name / id / submit control from the actual page, not guesses. Unclear authorization mechanism → ask the user.
2. Pick a role-specific post-login marker — something rendered only for this user (navbar username, data-user-role).
3. Confirm session storage — cookies (default) for server-rendered apps; localStorage/sessionStorage for SPAs. Verify after a manual login with I.executeScript(() => Object.keys(localStorage)). Cookie fetch/restore silently no-op against token storage.

Verify

Run a one-Scenario file that calls login(<role>) then asserts on the post-login marker:

npx codeceptjs run --grep '<scenario>' --debug    # real run, not dry — dry-run doesn't init plugins

Enable saveToFile: true only after this round-trip succeeds — a bad saved session masks a broken login.

Then wire into hooks/tests: Before(({ login }) => login()) for suite-wide, or per-test as needed.

Multi-role shape

Only after question 3 is answered. Keys named after whatever splits users in this system; one matching actor method per key:

users: {
  admin:      { login: (I) => I.loginAsAdmin() },
  workspaceB: { login: (I) => I.loginToWorkspaceB() },
}

Don't parameterise into a single login(key) — the plugin keys sessions by name, explicit methods read better. Switch mid-Scenario: session('<key>') opens a parallel browser context (fundamentals § Writing tests).

Token / localStorage auth

Override fetch / restore when sessions live outside cookies:

admin: {
  login: (I) => I.loginAsAdmin(),
  check: (I) => I.see('Admin', '.navbar'),
  fetch: (I) => I.executeScript(() => localStorage.getItem('session_id')),
  restore: (I, session) => {
    I.amOnPage('/')
    I.executeScript((s) => localStorage.setItem('session_id', s), session)
  },
}

check(I, session) receives whatever fetch returned — throw inside check to force fresh login (e.g. /me endpoint shows wrong user).

Pitfalls

• Credentials inlined in conf/test — always env-driven + secret().
• Forgetting to gitignore .env and output/*_session.json — both leak credentials.

Related skills

• codeceptjs-fundamentals — secrets rule, sessions, config mutation trap
• codeceptjs-exploration — reading the live login page
• writing-codeceptjs-tests / refactoring-codeceptjs-tests — invoke this skill when auth is identified
• debugging-codeceptjs-tests — auth-related failure patterns