Mocking Network Requests in Playwright
When testing modern web applications, you often encounter external APIs or third-party services that affect test reliability, speed, or cost. That’s where mocking network requests comes in. With Playwright, a powerful open-source tool from Microsoft, testers can intercept and simulate network traffic to make their test automation more stable and efficient.
At iHub Training Institute, the best playwright course provider in Hyderabad, we help you master real-time API mocking in Playwright—an essential skill for every modern QA professional.
✅ What is Network Request Mocking in Playwright?
Mocking means intercepting a network request during test execution and returning a predefined response instead of calling the actual server. This helps:
- Test different response scenarios (200, 400, 500)
- Avoid external API dependencies
- Speed up test execution
- Improve test reliability and repeatability
🔍 Why Use Playwright for Mocking?
Playwright provides native APIs to intercept HTTP requests using page.route() and mock them on the fly. It works seamlessly with modern frameworks and supports testing in Chromium, Firefox, and WebKit.
⚙️ Basic Example: Mocking an API in Playwright (JavaScript)
const { test, expect } = require('@playwright/test');
test('Mock API response example', async ({ page }) => {
await page.route('**/api/users', async route => {
const mockData = [{ id: 1, name: 'John Doe' }];
await route.fulfill({
status: 200,
contentType: 'application/json',
body: JSON.stringify(mockData),
});
});
await page.goto('https://yourapp.com');
await expect(page.locator('.user-name')).toHaveText('John Doe');
});
Here, we intercept the /api/users endpoint and mock the response with sample data.
🔄 Advanced Scenarios You’ll Learn at iHub
🔹 Simulating delayed responses (network latency)
🔹 Returning dynamic mock data based on requests
🔹 Mocking error responses (400, 401, 500)
🔹 Bypassing authentication calls
🔹 Mocking GraphQL queries and responses
All taught in our Playwright testing training with real-world use cases.
🧠 Benefits of Mocking in Automated Testing
✅ Isolates the frontend from backend changes
✅ Enables early testing before APIs are ready
✅ Facilitates testing rare or complex scenarios
✅ Reduces test flakiness and external failures
Whether you're testing UI components, APIs, or user flows, mocking gives you better control over test environments.
🎓 Why Learn Playwright at iHub Training Institute?
🔸 Real-time Projects Using Playwright with JavaScript/TypeScript
🔸 Integration with CI/CD, API Mocking, and Cross-Browser Testing
🔸 Expert Trainers with Hands-On Guidance
🔸 Career-Focused Curriculum with Placement Support
🔸 Weekday/Weekend Batch Options
We offer the best Playwright testing course in Hyderabad, perfect for beginners and experienced testers alike.
📈 Career Roles After Mastering Playwright
- QA Automation Engineer
- SDET (Software Development Engineer in Test)
- Frontend Test Automation Specialist
- API & Performance Tester
- DevOps Automation Engineer
Playwright is rapidly becoming the preferred tool for modern web app testing—so now is the right time to skill up.
📝 Conclusion
Mocking network requests in Playwright is a game-changer for frontend and API testing. It gives you complete control over test data and scenarios, improving both reliability and speed. Learn this cutting-edge skill through hands-on projects at iHub Training Institute and become a confident automation expert.
Learn Playwright Training in Hyderabad
Read More:
Automating File Uploads and Downloads
Testing Single Page Applications with Playwright
Playwright and Continuous Integration (CI)
Creating Custom Test Reports in Playwright
Visit our IHub Talent Training Institute
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