# How to Handle Password-Type OTP Input for Secure Display with vue3-otp-input

> Securely display OTP inputs with vue3-otp-input. Use input-type password to mask digits and block autofill while retaining full control.

- Repository: [Ejiro Asiuwhu/vue3-otp-input](https://github.com/ejirocodes/vue3-otp-input)
- Tags: how-to-guide
- Published: 2026-03-01

---

**Use the `input-type="password"` prop to mask each OTP digit and automatically inject a hidden autocomplete blocker that prevents browser autofill while maintaining full event emission and programmatic control.**

The `vue3-otp-input` library provides a dedicated password mode for scenarios requiring secure OTP entry, such as banking authentication or sensitive token verification. By setting the `inputType` prop to `"password"`, the component masks user input and disables browser autocomplete behaviors that could compromise security. This implementation leverages specific architectural patterns in [`src/components/vue3-otp-input.vue`](https://github.com/ejirocodes/vue3-otp-input/blob/main/src/components/vue3-otp-input.vue) and [`src/components/single-otp-input.vue`](https://github.com/ejirocodes/vue3-otp-input/blob/main/src/components/single-otp-input.vue) to ensure seamless functionality.

## How Password Mode Works in vue3-otp-input

### Masking Individual Digits

In [`src/components/single-otp-input.vue`](https://github.com/ejirocodes/vue3-otp-input/blob/main/src/components/single-otp-input.vue), the component computes the input type through the `inputTypeValue` computed property (lines 105-109). When the parent passes `input-type="password"`, this computed property returns `"password"`, causing the native HTML `<input>` element to render with `type="password"`. This triggers the browser's default masking behavior, displaying dots or asterisks instead of the actual characters.

### Blocking Browser Autofill

Browser autofill poses a security risk for OTP fields. To prevent this, [`src/components/vue3-otp-input.vue`](https://github.com/ejirocodes/vue3-otp-input/blob/main/src/components/vue3-otp-input.vue) (lines 21-28) conditionally renders a hidden text input when `inputType === 'password'`. This element includes `autocomplete="off"` and `style="display:none"`, which tricks browsers into recognizing the field as non-autofillable. This architectural choice ensures that password managers and browser autocomplete features do not interfere with secure OTP entry.

### State Management and Events

Despite the masking, the component maintains full functionality through its reactive state management. The `otp` ref stores the current values, while `activeInput` tracks the focused field. When users enter digits, the `handleOnChange` method triggers `changeCodeAtFocus`, which updates the state and emits the `on-change` event with the current value. Once the concatenated length of `otp.value` equals `props.numInputs`, the component emits `on-complete`, delivering the full masked OTP string to the parent component.

## Implementation Examples

### Basic Password-Type OTP Setup

To implement secure OTP entry, import the component and bind the `input-type` prop to `"password"`:

```vue
<script setup lang="ts">
import { ref } from "vue";
import VOtpInput from "vue3-otp-input";

const otpRef = ref<InstanceType<typeof VOtpInput> | null>(null);
const otpValue = ref("");

const onComplete = (value: string) => {
  console.log("OTP Complete:", value);
};

const onChange = (value: string) => {
  console.log("Current Value:", value);
};
</script>

<template>
  <v-otp-input
    ref="otpRef"
    v-model:value="otpValue"
    :num-inputs="6"
    input-type="password"
    :should-auto-focus="true"
    @on-change="onChange"
    @on-complete="onComplete"
    placeholder="●"
  />
</template>

```

This configuration masks each digit, prevents browser autocomplete, and maintains reactive two-way binding through `v-model:value`.

### Programmatic Control

The component exposes methods via `defineExpose` for runtime manipulation:

```vue
<template>
  <div>
    <v-otp-input
      ref="otpRef"
      input-type="password"
      :num-inputs="6"
    />
    <button @click="otpRef?.clearInput()">Clear Input</button>
    <button @click="otpRef?.fillInput('123456')">Fill Demo Code</button>
  </div>
</template>

```

The `clearInput()` method resets all internal state, while `fillInput(value)` programmatically populates the fields—useful for testing or resending OTP scenarios.

### Custom Styling for Masked Inputs

When using password mode, you may want distinct visual treatment for filled versus empty states:

```css
/* Global or scoped stylesheet */
.otp-password-field {
  width: 48px;
  height: 48px;
  font-size: 24px;
  text-align: center;
  border: 2px solid #e2e8f0;
  border-radius: 8px;
  transition: all 0.2s;
}

.otp-password-field:focus {
  border-color: #3b82f6;
  outline: none;
}

.otp-password-field.is-complete {
  background-color: #f1f5f9;
  border-color: #94a3b8;
}

```

Apply these classes through the `input-classes` prop:

```vue
<v-otp-input
  input-type="password"
  input-classes="otp-password-field"
  :num-inputs="6"
/>

```

## Key Source Files and Architecture

Understanding the source structure helps debug edge cases and customize behavior:

| File | Purpose | Critical Lines |
|------|---------|----------------|
| [`src/components/vue3-otp-input.vue`](https://github.com/ejirocodes/vue3-otp-input/blob/main/src/components/vue3-otp-input.vue) | Main wrapper managing OTP state (`otp`, `activeInput`), emitting events, and conditionally rendering the hidden autocomplete blocker for password mode. | Lines 21-28 (hidden input), Lines 45-49 (event emission) |
| [`src/components/single-otp-input.vue`](https://github.com/ejirocodes/vue3-otp-input/blob/main/src/components/single-otp-input.vue) | Individual input component computing `inputTypeValue` to apply `type="password"` and handling keyboard navigation, paste events, and focus management. | Lines 5-11 (template input binding), Lines 105-109 (computed type logic) |

The architecture separates concerns between state management (parent) and input rendering (child), allowing the password mode to function consistently across both single and multi-input configurations.

## Summary

- **Password masking** requires setting `input-type="password"`, which triggers `type="password"` on native inputs via the `inputTypeValue` computed property in [`single-otp-input.vue`](https://github.com/ejirocodes/vue3-otp-input/blob/main/single-otp-input.vue).
- **Autofill prevention** happens automatically when password mode is active; [`vue3-otp-input.vue`](https://github.com/ejirocodes/vue3-otp-input/blob/main/vue3-otp-input.vue) injects a hidden text field with `autocomplete="off"` to disable browser password managers.
- **Full API compatibility** is maintained in password mode, including `on-change` and `on-complete` events, `v-model:value` binding, and exposed methods `clearInput()` and `fillInput()`.
- **Custom styling** works identically to standard mode via the `input-classes` prop, allowing visual differentiation for masked fields.

## Frequently Asked Questions

### How do I prevent browser autofill on OTP fields when using vue3-otp-input?

The component automatically prevents autofill when you set `input-type="password"`. According to the source code in [`src/components/vue3-otp-input.vue`](https://github.com/ejirocodes/vue3-otp-input/blob/main/src/components/vue3-otp-input.vue) (lines 21-28), the component conditionally renders a hidden text input with `autocomplete="off"` and `style="display:none"` specifically when password mode is detected. This architectural pattern tricks browsers into recognizing the field as non-autofillable without requiring manual autocomplete attributes on visible inputs.

### Can I use password mode with numeric-only OTPs?

Yes, password mode works independently of the underlying input restrictions. While the `input-type="password"` prop controls the visual masking and autofill behavior, you can combine it with validation logic in your parent component to ensure only numeric values are accepted. The [`single-otp-input.vue`](https://github.com/ejirocodes/vue3-otp-input/blob/main/single-otp-input.vue) component handles the `type="password"` attribute through its `inputTypeValue` computed property (lines 105-109), which operates regardless of whether you subsequently validate for numbers, letters, or alphanumeric combinations in your `on-change` handler.

### How do I clear or reset the password OTP input programmatically?

The component exposes `clearInput()` and `fillInput(value)` methods via `defineExpose` in [`src/components/vue3-otp-input.vue`](https://github.com/ejirocodes/vue3-otp-input/blob/main/src/components/vue3-otp-input.vue) (lines 13-16). To clear the input, obtain a reference to the component using `ref<InstanceType<typeof VOtpInput>>` and call `otpRef.value?.clearInput()`. This resets the internal `otp` reactive array and clears all child input fields. To programmatically fill the OTP (useful for demo purposes or auto-fill scenarios), call `otpRef.value?.fillInput('123456')`, ensuring the string length matches your configured `num-inputs` prop.

### Does password mode affect the on-complete event payload?

No, password mode does not alter the event payload structure or content. Whether using standard or password mode, the `on-complete` event emits the complete OTP string exactly as entered by the user. The masking occurs purely at the presentation layer in [`single-otp-input.vue`](https://github.com/ejirocodes/vue3-otp-input/blob/main/single-otp-input.vue) through the native `type="password"` attribute, while the actual values are stored in the reactive `otp` array within [`vue3-otp-input.vue`](https://github.com/ejirocodes/vue3-otp-input/blob/main/vue3-otp-input.vue). When the joined length equals `num-inputs`, the component emits `emit("on-complete", otp.value.join(""))` (lines 45-49), delivering the unmasked string to your parent component handler regardless of visual masking.