An application you're working on requires form fields to be validated against data from a backend API. How would you achieve this in Angular?
- Implement asynchronous validators in Angular's Reactive Forms.
- Use Angular's built-in server-side validation.
- Use Angular's template-driven forms for API validation.
- Use JavaScript fetch API to validate form fields.
To validate form fields against data from a backend API in Angular, you should implement asynchronous validators in Angular's Reactive Forms. These validators allow you to make asynchronous API calls to validate form data. Using the JavaScript fetch API directly is possible but not as integrated and flexible as Angular's Reactive Forms. Angular's built-in server-side validation is a server-side concern and does not directly relate to Angular's validation. Template-driven forms do not provide the same level of control and flexibility for asynchronous validation as Reactive Forms.
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