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Async Validation with Angular Reactive Forms + Firebase
Fireship    14 February, 18, 6:19 pm
Video Description
Learn how to validate username uniqueness in Firebase with Angular Reactive Forms. We build a custom validator that checks the the Firestore DB for existing user records. https://angularfirebase.com/lessons/async-form-validation-in-firebase-enforce-uniqueness/

- Reactive Forms - https://angular.io/guide/reactive-forms
- Firestore - https://stackoverflow.com/questions/46549766/whats-the-difference-between-cloud-firestore-and-the-firebase-realtime-database
- AngularFire2 - https://github.com/angular/angularfire2
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