How to Get Specific Validation Errors with Angular Signal Forms

I f you’ve ever tried to build something like a password checklist in Signal Forms, you’ve probably run into a frustrating limitation. You need to know if a specific validation rule failed, but the errors API doesn’t make that easy. And if you try to rely on error indexes, things can break pretty quickly as errors come and go. This post walks through how Angular v22 gives us a simple fix for this with the new getError() function. A Password Checklist with Angular Signal Forms Here we have a simple sign-up form with a username and password field: For the password field, we have a list of requirements: One uppercase letter One number One special character And at least 8 characters As we add each required piece to the password, the UI updates letting us know each requirement has been met: We’re going to implement this specific functionality using the Signal Forms API. The tricky part here is that this UI isn’t just showing errors, we need to track each rule individually. Why Error Indexes