22 KiB
Executable file
Configuration
When to use: Setting up a new Playwright project, adjusting timeouts, adding browser targets, configuring CI behavior, or connecting environment-specific settings.
Quick Reference
npx playwright init # scaffold config + first test
npx playwright test --config=custom.config.ts # use non-default config
npx playwright test --project=chromium # run single project
npx playwright test --reporter=html # override reporter
npx playwright show-report # open last HTML report
DEBUG=pw:api npx playwright test # verbose Playwright logging
Production-Ready Config (Copy-Paste Starter)
TypeScript
// playwright.config.ts
import { defineConfig, devices } from '@playwright/test';
import dotenv from 'dotenv';
import path from 'path';
// Load environment variables from .env file
dotenv.config({ path: path.resolve(__dirname, '.env') });
export default defineConfig({
// ── Test discovery ──────────────────────────────────────────────
testDir: './tests',
testMatch: '**/*.spec.ts',
// ── Execution ───────────────────────────────────────────────────
fullyParallel: true,
forbidOnly: !!process.env.CI, // fail CI if test.only left in
retries: process.env.CI ? 2 : 0, // retry flakes in CI only
workers: process.env.CI ? '50%' : undefined, // half CPU in CI, auto locally
// ── Reporting ───────────────────────────────────────────────────
reporter: process.env.CI
? [['html', { open: 'never' }], ['github']]
: [['html', { open: 'on-failure' }]],
// ── Timeouts ────────────────────────────────────────────────────
timeout: 30_000, // per-test timeout
expect: {
timeout: 5_000, // per-assertion retry timeout
},
// ── Shared browser context options ──────────────────────────────
use: {
baseURL: process.env.BASE_URL || 'http://localhost:3000',
actionTimeout: 10_000, // click, fill, etc.
navigationTimeout: 15_000, // goto, waitForURL, etc.
// Artifact collection
trace: 'on-first-retry', // full trace on first retry only
screenshot: 'only-on-failure', // screenshot on failure
video: 'retain-on-failure', // video only kept for failures
// Sensible defaults
locale: 'en-US',
timezoneId: 'America/New_York',
extraHTTPHeaders: {
'x-test-automation': 'playwright',
},
},
// ── Projects (browser targets) ─────────────────────────────────
projects: [
{
name: 'chromium',
use: { ...devices['Desktop Chrome'] },
},
{
name: 'firefox',
use: { ...devices['Desktop Firefox'] },
},
{
name: 'webkit',
use: { ...devices['Desktop Safari'] },
},
{
name: 'mobile-chrome',
use: { ...devices['Pixel 7'] },
},
{
name: 'mobile-safari',
use: { ...devices['iPhone 14'] },
},
],
// ── Dev server ──────────────────────────────────────────────────
webServer: {
command: 'npm run dev',
url: 'http://localhost:3000',
reuseExistingServer: !process.env.CI,
timeout: 120_000, // 2 min for cold builds
stdout: 'pipe',
stderr: 'pipe',
},
});
JavaScript
// playwright.config.js
const { defineConfig, devices } = require('@playwright/test');
const dotenv = require('dotenv');
const path = require('path');
dotenv.config({ path: path.resolve(__dirname, '.env') });
module.exports = defineConfig({
testDir: './tests',
testMatch: '**/*.spec.js',
fullyParallel: true,
forbidOnly: !!process.env.CI,
retries: process.env.CI ? 2 : 0,
workers: process.env.CI ? '50%' : undefined,
reporter: process.env.CI
? [['html', { open: 'never' }], ['github']]
: [['html', { open: 'on-failure' }]],
timeout: 30_000,
expect: {
timeout: 5_000,
},
use: {
baseURL: process.env.BASE_URL || 'http://localhost:3000',
actionTimeout: 10_000,
navigationTimeout: 15_000,
trace: 'on-first-retry',
screenshot: 'only-on-failure',
video: 'retain-on-failure',
locale: 'en-US',
timezoneId: 'America/New_York',
extraHTTPHeaders: {
'x-test-automation': 'playwright',
},
},
projects: [
{
name: 'chromium',
use: { ...devices['Desktop Chrome'] },
},
{
name: 'firefox',
use: { ...devices['Desktop Firefox'] },
},
{
name: 'webkit',
use: { ...devices['Desktop Safari'] },
},
{
name: 'mobile-chrome',
use: { ...devices['Pixel 7'] },
},
{
name: 'mobile-safari',
use: { ...devices['iPhone 14'] },
},
],
webServer: {
command: 'npm run dev',
url: 'http://localhost:3000',
reuseExistingServer: !process.env.CI,
timeout: 120_000,
stdout: 'pipe',
stderr: 'pipe',
},
});
Patterns
Pattern 1: Environment-Specific Configuration
Use when: Tests run against dev, staging, and production environments. Avoid when: Single-environment local-only projects.
TypeScript
// playwright.config.ts
import { defineConfig } from '@playwright/test';
import dotenv from 'dotenv';
import path from 'path';
// Load environment-specific .env file: .env.staging, .env.production, etc.
const ENV = process.env.TEST_ENV || 'local';
dotenv.config({ path: path.resolve(__dirname, `.env.${ENV}`) });
const envConfig: Record<string, { baseURL: string; retries: number }> = {
local: { baseURL: 'http://localhost:3000', retries: 0 },
staging: { baseURL: 'https://staging.example.com', retries: 2 },
production: { baseURL: 'https://www.example.com', retries: 2 },
};
const env = envConfig[ENV];
export default defineConfig({
testDir: './tests',
testMatch: '**/*.spec.ts',
retries: env.retries,
use: {
baseURL: env.baseURL,
},
});
# Run against staging
TEST_ENV=staging npx playwright test
# Run against production (subset of smoke tests)
TEST_ENV=production npx playwright test --grep @smoke
JavaScript
// playwright.config.js
const { defineConfig } = require('@playwright/test');
const dotenv = require('dotenv');
const path = require('path');
const ENV = process.env.TEST_ENV || 'local';
dotenv.config({ path: path.resolve(__dirname, `.env.${ENV}`) });
const envConfig = {
local: { baseURL: 'http://localhost:3000', retries: 0 },
staging: { baseURL: 'https://staging.example.com', retries: 2 },
production: { baseURL: 'https://www.example.com', retries: 2 },
};
const env = envConfig[ENV];
module.exports = defineConfig({
testDir: './tests',
testMatch: '**/*.spec.js',
retries: env.retries,
use: {
baseURL: env.baseURL,
},
});
Pattern 2: Multi-Project with Setup Dependencies
Use when: Tests need shared authentication state or database seeding before running. Avoid when: Tests are fully independent with no shared setup phase.
TypeScript
// playwright.config.ts
import { defineConfig, devices } from '@playwright/test';
export default defineConfig({
testDir: './tests',
testMatch: '**/*.spec.ts',
projects: [
// Setup project runs first, saves auth state
{
name: 'setup',
testMatch: /global\.setup\.ts/,
},
// Browser projects depend on setup
{
name: 'chromium',
use: {
...devices['Desktop Chrome'],
storageState: 'playwright/.auth/user.json',
},
dependencies: ['setup'],
},
{
name: 'firefox',
use: {
...devices['Desktop Firefox'],
storageState: 'playwright/.auth/user.json',
},
dependencies: ['setup'],
},
],
});
// tests/global.setup.ts
import { test as setup, expect } from '@playwright/test';
const authFile = 'playwright/.auth/user.json';
setup('authenticate', async ({ page }) => {
await page.goto('/login');
await page.getByLabel('Email').fill('user@example.com');
await page.getByLabel('Password').fill(process.env.TEST_PASSWORD!);
await page.getByRole('button', { name: 'Sign in' }).click();
await expect(page.getByRole('heading', { name: 'Dashboard' })).toBeVisible();
await page.context().storageState({ path: authFile });
});
JavaScript
// playwright.config.js
const { defineConfig, devices } = require('@playwright/test');
module.exports = defineConfig({
testDir: './tests',
testMatch: '**/*.spec.js',
projects: [
{
name: 'setup',
testMatch: /global\.setup\.js/,
},
{
name: 'chromium',
use: {
...devices['Desktop Chrome'],
storageState: 'playwright/.auth/user.json',
},
dependencies: ['setup'],
},
{
name: 'firefox',
use: {
...devices['Desktop Firefox'],
storageState: 'playwright/.auth/user.json',
},
dependencies: ['setup'],
},
],
});
// tests/global.setup.js
const { test: setup, expect } = require('@playwright/test');
const authFile = 'playwright/.auth/user.json';
setup('authenticate', async ({ page }) => {
await page.goto('/login');
await page.getByLabel('Email').fill('user@example.com');
await page.getByLabel('Password').fill(process.env.TEST_PASSWORD);
await page.getByRole('button', { name: 'Sign in' }).click();
await expect(page.getByRole('heading', { name: 'Dashboard' })).toBeVisible();
await page.context().storageState({ path: authFile });
});
Pattern 3: webServer with Build Step
Use when: Tests need a running application server. Let Playwright manage the server lifecycle. Avoid when: Testing against an already-deployed environment (staging/prod).
TypeScript
// playwright.config.ts
import { defineConfig } from '@playwright/test';
export default defineConfig({
testDir: './tests',
testMatch: '**/*.spec.ts',
use: {
baseURL: 'http://localhost:3000',
},
webServer: {
command: process.env.CI
? 'npm run build && npm run start' // production build in CI
: 'npm run dev', // dev server locally
url: 'http://localhost:3000',
reuseExistingServer: !process.env.CI,
timeout: 120_000,
stdout: 'pipe',
stderr: 'pipe',
env: {
NODE_ENV: 'test',
DATABASE_URL: process.env.DATABASE_URL || 'postgresql://localhost:5432/test',
},
},
});
JavaScript
// playwright.config.js
const { defineConfig } = require('@playwright/test');
module.exports = defineConfig({
testDir: './tests',
testMatch: '**/*.spec.js',
use: {
baseURL: 'http://localhost:3000',
},
webServer: {
command: process.env.CI
? 'npm run build && npm run start'
: 'npm run dev',
url: 'http://localhost:3000',
reuseExistingServer: !process.env.CI,
timeout: 120_000,
stdout: 'pipe',
stderr: 'pipe',
env: {
NODE_ENV: 'test',
DATABASE_URL: process.env.DATABASE_URL || 'postgresql://localhost:5432/test',
},
},
});
Pattern 4: globalSetup / globalTeardown
Use when: One-time non-browser work: seeding a database, starting a service, setting env vars. Runs once per npx playwright test invocation.
Avoid when: You need browser context (use a setup project instead) or per-test isolation (use fixtures).
TypeScript
// playwright.config.ts
import { defineConfig } from '@playwright/test';
export default defineConfig({
testDir: './tests',
testMatch: '**/*.spec.ts',
globalSetup: './tests/global-setup.ts',
globalTeardown: './tests/global-teardown.ts',
});
// tests/global-setup.ts
import { FullConfig } from '@playwright/test';
async function globalSetup(config: FullConfig) {
// Seed test database
const { execSync } = await import('child_process');
execSync('npx prisma db seed', { stdio: 'inherit' });
// Store data for tests to use via environment variables
process.env.TEST_RUN_ID = `run-${Date.now()}`;
}
export default globalSetup;
// tests/global-teardown.ts
import { FullConfig } from '@playwright/test';
async function globalTeardown(config: FullConfig) {
const { execSync } = await import('child_process');
execSync('npx prisma db push --force-reset', { stdio: 'inherit' });
}
export default globalTeardown;
JavaScript
// playwright.config.js
const { defineConfig } = require('@playwright/test');
module.exports = defineConfig({
testDir: './tests',
testMatch: '**/*.spec.js',
globalSetup: './tests/global-setup.js',
globalTeardown: './tests/global-teardown.js',
});
// tests/global-setup.js
const { execSync } = require('child_process');
async function globalSetup(config) {
execSync('npx prisma db seed', { stdio: 'inherit' });
process.env.TEST_RUN_ID = `run-${Date.now()}`;
}
module.exports = globalSetup;
// tests/global-teardown.js
const { execSync } = require('child_process');
async function globalTeardown(config) {
execSync('npx prisma db push --force-reset', { stdio: 'inherit' });
}
module.exports = globalTeardown;
Pattern 5: .env File Setup
Use when: Managing secrets, URLs, or feature flags without hardcoding.
Avoid when: Never commit .env files with real secrets. Provide .env.example instead.
# .env.example (commit this)
BASE_URL=http://localhost:3000
TEST_PASSWORD=
API_KEY=
# .env.local (gitignored)
BASE_URL=http://localhost:3000
TEST_PASSWORD=s3cret
API_KEY=test-key-abc123
# .env.staging (gitignored)
BASE_URL=https://staging.example.com
TEST_PASSWORD=staging-password
API_KEY=staging-key-xyz789
# .gitignore
.env
.env.local
.env.staging
.env.production
playwright/.auth/
Install dotenv:
npm install -D dotenv
Pattern 6: Trace, Screenshot, and Video Settings
Use when: Deciding artifact collection strategy for local development vs CI.
| Setting | Local | CI | Why |
|---|---|---|---|
trace |
'off' or 'on-first-retry' |
'on-first-retry' |
Traces are large; only collect on failure |
screenshot |
'off' |
'only-on-failure' |
Useful for CI debugging only |
video |
'off' |
'retain-on-failure' |
Video is slow to record; keep only failures |
TypeScript
// playwright.config.ts
import { defineConfig } from '@playwright/test';
export default defineConfig({
testDir: './tests',
testMatch: '**/*.spec.ts',
use: {
// CI: capture everything on failure; Local: minimal overhead
trace: process.env.CI ? 'on-first-retry' : 'off',
screenshot: process.env.CI ? 'only-on-failure' : 'off',
video: process.env.CI ? 'retain-on-failure' : 'off',
},
});
JavaScript
// playwright.config.js
const { defineConfig } = require('@playwright/test');
module.exports = defineConfig({
testDir: './tests',
testMatch: '**/*.spec.js',
use: {
trace: process.env.CI ? 'on-first-retry' : 'off',
screenshot: process.env.CI ? 'only-on-failure' : 'off',
video: process.env.CI ? 'retain-on-failure' : 'off',
},
});
Decision Guide
Which Timeout to Adjust
| Symptom | Timeout to Change | Default | Recommended Range |
|---|---|---|---|
| Test takes too long overall | timeout |
30s | 30-60s (never above 120s) |
Assertion expect() keeps retrying too long or not long enough |
expect.timeout |
5s | 5-10s |
page.goto() or waitForURL() times out |
navigationTimeout |
30s | 10-30s |
click(), fill(), check() time out |
actionTimeout |
0 (no limit) | 10-15s |
| Dev server slow to start | webServer.timeout |
60s | 60-180s |
Server Management
| Scenario | Approach | Why |
|---|---|---|
| Local dev + CI, app in same repo | webServer with reuseExistingServer: !process.env.CI |
Playwright manages server; reuses yours locally |
| Separate frontend/backend repos | Manual start or Docker Compose | webServer can only run one command |
| Testing deployed staging/production | No webServer; set baseURL via env var |
Server already running remotely |
| Multiple services needed (API + frontend) | Array of webServer entries |
Each gets its own command and URL health check |
Single vs Multi-Project Config
| Scenario | Approach | Why |
|---|---|---|
| Starting out, early development | Single project (chromium only) | Faster feedback, simpler config |
| Pre-release cross-browser validation | Multi-project: chromium + firefox + webkit | Catch rendering/API differences |
| Mobile-responsive app | Add mobile projects alongside desktop | Viewport + touch differences matter |
| Authenticated + unauthenticated tests | Setup project + dependent projects | Share auth state without re-login per test |
| CI pipeline with tight time budget | Chromium in PR checks; all browsers on merge to main | Balance speed vs coverage |
globalSetup vs Setup Projects vs Fixtures
| Need | Use | Why |
|---|---|---|
| One-time DB seed or external service prep | globalSetup |
Runs once, no browser needed |
| Shared browser auth (login once, reuse cookies) | Setup project with dependencies |
Needs browser context; globalSetup has none |
| Per-test isolated state (unique user, fresh data) | Custom fixture via test.extend() |
Each test gets its own instance with teardown |
| Cleanup after all tests | globalTeardown |
Runs once at the end regardless of pass/fail |
Anti-Patterns
| Don't Do This | Problem | Do This Instead |
|---|---|---|
timeout: 300_000 globally |
Masks flaky tests; CI runs take forever | Fix the root cause; keep timeout at 30s; raise navigationTimeout only if warranted |
Hardcoded URLs in tests: page.goto('http://localhost:3000/login') |
Breaks in every non-local environment | Use baseURL in config, then page.goto('/login') |
| Running chromium + firefox + webkit on every PR | 3x CI time for marginal benefit on most PRs | Chromium on PRs; all browsers on main branch merges |
trace: 'on' always in CI |
Huge artifacts, slow uploads, disk full | trace: 'on-first-retry' -- only captures when a test fails and retries |
video: 'on' always in CI |
Massive CI storage; recording slows tests | video: 'retain-on-failure' -- records all but only keeps failures |
Config values inline in test files: test.use({ viewport: { width: 1280, height: 720 } }) in every file |
Scattered, hard to maintain, inconsistent | Define once in project config; override per-file only when genuinely needed |
retries: 3 locally |
Hides flakiness during development | retries: 0 locally, retries: 2 in CI |
No forbidOnly in CI |
Accidentally committed test.only runs a single test, everything else silently skipped |
forbidOnly: !!process.env.CI |
globalSetup for browser auth |
No browser context available; complex workarounds needed | Use a setup project with dependencies |
Committing .env files with real credentials |
Security risk | Commit .env.example only; gitignore real .env files |
Troubleshooting
"baseURL" not working -- tests navigate to full URL
Cause: Using page.goto('http://localhost:3000/path') instead of page.goto('/path'). When goto receives an absolute URL, it ignores baseURL.
Fix: Always pass relative paths to page.goto():
// Wrong -- ignores baseURL
await page.goto('http://localhost:3000/dashboard');
// Correct -- uses baseURL from config
await page.goto('/dashboard');
webServer starts but tests still fail with connection refused
Cause: The url in webServer does not match what the server actually serves, or the health check endpoint returns non-200.
Fix: Ensure webServer.url matches the actual server address. Add a health check route if needed:
// playwright.config.ts
import { defineConfig } from '@playwright/test';
export default defineConfig({
testDir: './tests',
testMatch: '**/*.spec.ts',
webServer: {
command: 'npm run dev',
url: 'http://localhost:3000/api/health', // use a real endpoint
reuseExistingServer: !process.env.CI,
timeout: 120_000,
},
});
Tests pass locally but timeout in CI
Cause: CI machines are slower. Default timeouts too tight for CI hardware.
Fix: Increase navigationTimeout for CI, reduce workers to avoid resource contention:
// playwright.config.ts
import { defineConfig } from '@playwright/test';
export default defineConfig({
testDir: './tests',
testMatch: '**/*.spec.ts',
workers: process.env.CI ? '50%' : undefined,
use: {
navigationTimeout: process.env.CI ? 30_000 : 15_000,
actionTimeout: process.env.CI ? 15_000 : 10_000,
},
});
"Error: page.goto: Target page, context or browser has been closed"
Cause: Test exceeded its timeout and Playwright tore down the browser while an action was still running.
Fix: Do not increase the global timeout. Instead, find the slow step using --trace on and fix it. Common causes: waiting for a slow API, unresolved network request, or missing await.
# Record a trace for debugging
npx playwright test --trace on
npx playwright show-report
Related
- core/fixtures-and-hooks.md -- custom fixtures that replace
globalSetupfor per-test state - core/test-organization.md -- file structure, naming conventions, test grouping
- core/authentication.md -- setup projects for shared auth state
- ci/ci-github-actions.md -- CI-specific config and caching
- ci/projects-and-dependencies.md -- advanced multi-project patterns