Typed Reactive Forms
Build forms with strict typing.
Typed Reactive Forms is a free Angular Academy lesson on CoddyKit — lesson 1 of 4. You can read the complete lesson below for free — then practise it hands-on in the browser with a built-in code editor and a 24/7 AI tutor. It is part of the Angular Academy learning path, one of 4 lessons in the course, and your progress syncs across the web and the CoddyKit app.
Why Typed Forms?
Before Angular 14, reactive form values were typed as any. Typed reactive forms give full type safety: the compiler knows the shape of your form value and control names.
A Typed FormControl
A FormControl is generic. Provide the value type so reads and writes are checked.
const name = new FormControl<string>('', {
nonNullable: true
});A Typed FormGroup
A FormGroup infers its value type from the controls you pass.
const form = new FormGroup({
email: new FormControl(''),
age: new FormControl(0)
});Inferred Value Type
The value of the group above is typed as { email: string | null; age: number | null }, all checked at compile time.
const v = form.value; // typed automaticallyNullability
By default controls can be reset to null, so their value type includes | null. Use nonNullable to exclude null.
new FormControl('', { nonNullable: true });
// value type: string (no null)Accessing Controls Safely
form.controls.email is strongly typed, so typos in control names are caught by the compiler.
form.controls.email.setValue('a@b.com');get vs controls
Prefer form.controls.name over form.get('name') for type safety; get returns a loosely typed AbstractControl | null.
getRawValue
getRawValue() returns all values including disabled controls, unlike value which omits disabled ones.
const all = form.getRawValue();Nested Groups
Typed groups compose. A nested FormGroup contributes its own typed shape to the parent value.
const form = new FormGroup({
user: new FormGroup({
first: new FormControl(''),
last: new FormControl('')
})
});patchValue Type Safety
patchValue accepts a partial of the form value; unknown keys are flagged by the compiler.
form.patchValue({ email: 'x@y.com' });Migrating Legacy Forms
Untyped APIs like UntypedFormGroup exist for gradual migration. New code should use the typed classes for safety.
Quick Check
Test your understanding of typed reactive forms.
Recap
You learned that typed reactive forms make FormControl/FormGroup generic, inferring a checked value shape, that defaults include | null (avoidable with nonNullable), and that controls access is safer than get.
Frequently asked questions
Is the “Typed Reactive Forms” lesson free?
Yes — the full text of “Typed Reactive Forms” is free to read here on the web, and the Angular Academy course includes 4 lessons in total. To practise it interactively (a built-in code editor and a 24/7 AI tutor) and unlock the rest of the Angular Academy course, upgrade to CoddyKit PRO.
What will I learn in “Typed Reactive Forms”?
Build forms with strict typing. You practise Angular Academy with hands-on code you run directly in the browser, and a 24/7 AI tutor answers your questions as you work through the lesson.
Do I need any experience to start Angular Academy?
No prior experience is required. Angular Academy on CoddyKit is structured for beginners through advanced learners; this is — lesson 1 of 4, so you can start here or from the beginning and move at your own pace.
How long does the “Typed Reactive Forms” lesson take?
Most CoddyKit lessons take about 5–10 minutes. Each one is bite-sized and interactive, so you make steady progress and pick up exactly where you left off across the web and the app.
Can I write and run code in this Angular Academy lesson?
Yes. Every Angular Academy lesson includes a built-in code editor, so you write and run real code right in your browser and get instant AI feedback — no local setup required.
All lessons in this course
- Typed Reactive Forms
- FormArray and Dynamic Fields
- Async Validators
- FormBuilder Patterns