Error Handling

Module 01

Form Validator

Classic try / catch pattern. Each field throws a custom error with a clear message when validation fails.

Name

Age

Module 02

Division Machine

JavaScript returns Infinity for division by zero — not an error. We use throw to enforce our own rules.

First Number

Second Number — try zero

What's happening

We manually throw new Error() to create a custom error with a meaningful message instead of silently returning a bad value.

Module 03

Async Error Catcher

try / catch with async/await. A 404 does not throw automatically — you must check response.ok.

Scenario

Sending request

Checking response status

Parsing JSON

Module 04

The Finally Block

finally always runs — whether the try succeeded or catch triggered. Use it for cleanup.

Password — hint: the word "correct"

Why finally matters

Think of it as a door that always closes behind you — pass or fail. Use it to clear inputs, reset loaders, and write audit logs.

Output Console

// Interact with any module above to see output here.