Form Forge

JavaScriptIntermediateabout 8 hours14 lessons

Recommended first: Turbo Garage in JavaScript

Every web app lives or dies by what it does with text people type. You build the engine behind a sign-up and checkout form: parse and tidy messy input, check it with regular expressions, report every problem clearly, and send clean JSON to a server that does not trust you. Your functions drive a live form, and a fuzz button hurls hostile input at them.

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Learning path

Each lesson adds one working part to your build.

Chapter 1

Data in hand

Arrays, objects and strings: the shapes every piece of form input arrives in.

0/4 done

Chapter 2

Pattern matching

Regular expressions: recognise, extract and rewrite text, and use them safely.

0/3 done

Chapter 3

When things go wrong

Errors with names and causes, and JSON in both directions.

0/3 done

Chapter 4

The validation engine

Rules as data, validators from small parts, a server that trusts nobody, and one schema to run it all.

0/4 done

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