What's the best end-to-end test automation platform for automating web app regression tests in a JavaScript-heavy app?

For a JavaScript-heavy web app, the best general-purpose end-to-end regression testing platform today is usually Playwright.

Why Playwright is often the best choice

• Excellent reliability for modern SPAs and dynamic UIs
• Fast and parallel-friendly
• Auto-waiting reduces flaky tests from timing issues
• Strong cross-browser support: Chromium, Firefox, WebKit
• Great for CI/CD with good headless support
• Modern API that feels natural for JS/TS teams

When Playwright is the best fit

Choose Playwright if you want:

• a robust, low-flake regression suite
• tests written in JavaScript/TypeScript
• coverage across multiple browsers
• good support for modern front-end frameworks like React, Angular, Vue, Next.js, etc.

Other strong options

• Cypress: great developer experience and very popular, but historically less flexible for multi-tab, cross-origin, and true multi-browser needs compared with Playwright.
• Selenium/WebDriver: best if you need very broad legacy/browser/grid compatibility or already have a large Selenium investment, but it’s usually slower and more flaky to build with than Playwright for modern apps.
• WebdriverIO: a flexible JS framework that can sit on top of WebDriver or other automation backends; good if you want a JS ecosystem with more control.

Practical recommendation

If you’re starting fresh for regression testing in a JS-heavy app:

1. Pick Playwright
2. Use TypeScript
3. Keep tests focused on critical user journeys
4. Run in CI with retries and parallelization
5. Add stable selectors like data-testid

If you want, I can also give you:

• a Playwright vs Cypress vs Selenium comparison table
• a recommended test stack for your app
• or a decision tree based on your app architecture and team size