🔍 Introduction
API testing has always been a critical part of backend and full-stack development. Whether you’re building an e-commerce site, a social app, or a SaaS tool—your backend endpoints must be tested thoroughly. But the traditional methods like Postman, curl scripts, or writing custom tests are time-consuming and often repetitive.
Enter Keploy, an open-source API testing platform that leverages AI to capture real-time API calls and convert them into test cases—automatically! In this blog, I’ll share my experience using the Keploy Chrome Extension to test live websites with real API traffic.
😫 The Struggle with Manual API Testing
Before Keploy, I used tools like:
- Postman to manually define endpoints and check responses
- curl commands to simulate requests
- Jest/Supertest for writing test suites in Node.js apps
While effective, these methods were:
- Time-consuming
- Not scalable for large apps
- Hard to maintain when APIs changed frequently
🧠 What is Keploy Chrome Extension?
The Keploy Chrome Extension simplifies API testing by:
- Recording API requests directly from browser traffic
- Auto-generating test cases and mocks
- Allowing quick replay and validation
It’s designed for developers and testers to get full test coverage in minutes, not hours.
🌐 Websites I Tested
✅ 1. JSONPlaceholder
Steps I followed:
- Opened DevTools → Network
- Enabled Keploy Chrome Extension and clicked “Start Recording”
- Hit endpoints like
/posts,/users,/comments - Clicked “Stop Recording”
- Instantly got test cases for all captured API calls
📌 Keploy captured GET requests and response payloads automatically.
✅ 2. Weather.com
Steps I followed:
- Visited the homepage and searched for weather in “Delhi”
- Observed multiple API calls in the background (XHR)
- Keploy Extension picked up dynamic requests like:
- Forecast by location
- Current weather data
📌 Keploy helped me visualize the hidden APIs that power the UI!
📊 Keploy vs Manual Testing
| Feature | Manual Testing | Keploy Extension |
|---|---|---|
| Test Creation | Manual (Postman, curl) | Auto-generated |
| Mocking Responses | Needs setup | Built-in |
| Time to Write | 20–30 mins per feature | < 2 mins |
| Test Coverage | Partial (depends on effort) | 100% (based on real traffic) |
| Reusability in CI/CD | Extra effort | Keploy supports CI pipelines |
💡 First Impressions
- Super fast: I could test multiple endpoints without writing a line of code.
- Real traffic-based testing: No need to guess how users interact with my APIs.
- Perfect for microservices and modern frontend-backend apps.
🔥 What Excited Me the Most
- Moving from manual to AI-generated tests is a big leap for productivity.
- I can combine Keploy CLI with the Chrome extension to fully automate backend testing.
- Seamless integration with GitHub Actions means I can run tests for every push.
✍️ Conclusion
Keploy’s Chrome Extension made API testing effortless and powerful. I was able to:
- Test two different real-world websites
- Capture and replay real API traffic
- Eliminate manual test writing
If you're a developer or QA working with APIs, Keploy is a must-try tool to level up your testing game!
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