Angular Reactive Forms Tutorial | Build an Expense Tracker App with Validation (Step-by-Step)
In this video, we upgrade our *Expense Tracker* app by replacing scattered `ngModel` signals with Angular's powerful *Reactive Forms* — giving us a single, structured object to handle input, validation, and state all in one place.
*🔥 What you'll learn:*
Why `ngModel` falls apart as your form grows — and what Reactive Forms fix
The 3 core building blocks: `FormControl`, `FormGroup`, and `Validators`
How `FormControl` tracks more than just value — `touched`, `dirty`, `valid` states
Declarative validators: `Validators.required`, `Validators.min()`, and custom error messages
Connecting your TypeScript `FormGroup` to the HTML template using `formGroup` and `formControlName` directives
Why you can't use `[(ngModel)]` directly on a Signal — and how to handle it
`getRawValue()`, `reset()`, `patchValue()` vs `setValue()` — when to use each
Building a *second form on the same page* (Budget Limit Editor) that updates a Signal directly
The full lifecycle of a reactive form field from load → interaction → validation → submit → reset
*🛠️ Project context:*
We're building a real *Expense Tracker* throughout this series — so every concept you learn gets applied immediately, helping you build your portfolio while mastering Angular.
*📁 Topics covered in this video:*
`ReactiveFormsModule` · `FormGroup` · `FormControl` · `Validators` · `formControlName` · `ngSubmit` · `patchValue` · `getRawValue` · inline validation messages · disabled submit button · budget editor form
🔔 *Subscribe* so you don't miss the next step in the Expense Tracker build!
👍 *Like* if Reactive Forms finally clicked for you
💬 *Comment* if you have questions — I read every one
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