---
title: Validation states
summary: To inform users whether the entered value is correct or not, use either of the validation states. Thanks to that, users will immediately know which form elements they need to correct and, if the state displays as invalid, why the value is incorrect.
description: Show valid and invalid states on form fields with feedback messages, so users know exactly what to correct before submitting.
related: [/ui/forms/form-elements, /ui/forms/form-helpers]
---
import Example from '@components/Example.astro';
import CodeDocs from '@components/CodeDocs.astro';

## Validation states

To inform users whether the entered value is correct or not, use either of the validation states. Thanks to that, users will immediately know which form elements they need to correct and, if the state displays as invalid, why the value is incorrect.

To apply the validation state to the form control, use the `.is-valid` and `.is-invalid` classes. For assistive tech, also set `aria-invalid="true"` on invalid controls.

<Example>
<input type="text" class="form-control is-valid" placeholder="Valid State..." aria-invalid="false" /> <input type="text" class="form-control is-invalid" placeholder="Invalid State..." aria-invalid="true" />
</Example>

## Validation feedback

To provide users with additional information about the validation state, you can use the `.valid-feedback` and `.invalid-feedback` classes. Link the message with `aria-describedby` when you can.

<Example>
<div> <label class="form-label required" for="city-invalid">City</label> <input type="text" class="form-control is-invalid" id="city-invalid" required aria-invalid="true" aria-describedby="city-invalid-feedback" /> <div class="invalid-feedback" id="city-invalid-feedback">Please provide a valid city.</div> </div>
</Example>

You can also use the `.valid-feedback` to provide users with positive feedback.

<Example>
<div> <label class="form-label required">City</label> <input type="text" class="form-control is-valid" value="Warsaw" /> <div class="valid-feedback">Looks good!</div> </div>
</Example>

## Subtle validation states

If you prefer a more subtle manner of informing users of the input control validation state, you can use tick and cross symbols and refrain from using colored control frames and the validation feedback.

To do this, use the `.is-valid-lite` and `.is-invalid-lite` classes.

<Example>
<input type="text" class="form-control is-valid is-valid-lite" placeholder="Valid State..." /> <input type="text" class="form-control is-invalid is-invalid-lite" placeholder="Invalid State..." />
</Example>

## SCSS variables

Use these SCSS variables to customize form validation states. The default values are:

<CodeDocs name="form-validation-variables" file="core/scss/_variables.scss" />