What If Your Mock API Actually Remembered Your POST Requests?
A while ago, I was deep into building a new frontend project. I had spent hours polishing the interface — the form validation was tight, the loading states looked smooth, and I was finally ready to test the full CRUD (Create, Read, Update, Delete) workflow. The backend wasn't ready yet, so like any developer, I reached for a popular free dummy API to wire up my requests. I filled out the creation…
In the article "What If Your Mock API Actually Remembered Your POST Requests?" the author recounts an experience while building a new frontend project. They were pleased with the polished interface and mock API, but soon discovered that the mock API did not persist data correctly. When they tested a POST request to create a new item, the item would disappear upon reloading the page.
The author found that using local component state or disposable local servers was not sufficient for testing real HTTP behavior. This led them to create Playground API, a stateful mock API that remembers POST, PATCH, and DELETE requests within a browser session, providing a more realistic testing environment. The article explains how this system works and demonstrates its use with sample code.
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