Chaos Engineering in the Browser: Testing Network Failures

"It works on my machine."

We have all said it. But your users aren't on your machine. They are on a train going through a tunnel, or on a crowded coffee shop Wi-Fi.

Chaos Engineering is the practice of intentionally breaking things to see how your system responds. You can do this right inside your browser with Mock Studio.

The "Happy Path" Trap

Most developers spend 90% of their time coding for the "Success" (HTTP 200) scenario. But what happens when:

• The payment gateway times out?
• The auth service returns a 500 error?
• The user is offline?

If you haven't tested these, your users will verify them for you. And they won't be happy.

Simulating Chaos with Mock Studio

1. The "Server on Fire" (HTTP 500)

Verify your error boundaries and alert banners.

• Action: In Mock Studio, change your user profile endpoint status to 500 Internal Server Error.
• Test: Does the app crash? Do you see a white screen? Or do you see a graceful "Something went wrong" toast?

2. The "Eternal Spinner" (Timeout)

Verify your loading states and timeout logic.

• Action: Add a Delay of 5000ms (5 seconds) to your critical endpoints.
• Test: Does the user see a spinner? strict skeleton loader? Or does the button just sit there looking dead?

3. The "Rate Limit" (HTTP 429)

Verify your retry logic.

• Action: Set status to 429 Too Many Requests.
• Test: Does your polling hook stop polling? Or does it DDoS your own API?

Why Do This?

Resilience isn't an accident. It's a feature. By simulating these failures locally, you catch UX disasters before they reach production.

Start breaking your app (controlled!) today with Mock Studio.