🔐 OTP Angular

Otp Angular is a lightweight, highly customizable, and dependency-free OTP (One-Time Password) input component built for Angular 20+ applications. It offers seamless integration, flexible configuration, and a polished user experience for OTP or verification inputs. The component now also includes a built-in resend option, making it easy to handle OTP resubmission flows directly within the UI.

✅ Supports Angular 20+
🔧 Fully customizable
🎯 Keyboard navigation support
🧪 Easily testable & maintainable
💡 Auto-focus, password-style, number-only, and more

---

---

📦 Installation

npm install otp-angular

---

🚀 latest Changes in 1.0.1

• Emits null instead of an empty string if no value is supplied
• Resend Option added if you add resend as option then it will open

---

Usage

For Component

import { OtpAngular } from 'otp-angular';

@Component({
  imports: [...others, OtpAngular]
})

For Template

<!-- With Event Binding -->
<otp-angular [config]="{length: 4}" (onInputChange)="onInputChange($event)"  (onResendAvailable)="resend($event)" />

---

⚙️ Inputs/Outputs

Option	Type	required	Description	Default
disabled	boolean	No	Disables otp when set to true	false
onInputChange	Output	No	Emits the OTP value on change, it's return string, number or null	—
onResendAvailable	Output	No	Emits when you click resend option, as a boolean(true)	—
setValue	function	No	Set the otp value	—
reset	function	No	Reset the Resend	—
config	object	Yes	Configure based on option. (see Config Options below)	{ length: 4 }

⚙️ Config Options

Option	Type	required	Description	Default
length	number	Yes	Number of OTP digits	4
numbersOnly	boolean	No	Allow only numeric input	false
autoFocus	boolean	No	Auto-focus first input	false
isPassword	boolean	No	Mask input characters	false
showError	boolean	No	Show red border on error	false
showCaps	boolean	No	Transform to Capital letters	false
containerClass	string or string[]	No	Custom CSS class for container	—
containerStyles	object	No	Inline styles for container	{}
inputClass	string or string[]	No	Custom class for input boxes	—
inputStyles	object or object[]	No	Inline styles for input fields	{}
placeholder	string	No	Placeholder for each input box	''
separator	string	No	Optional separator character	''
resend	number	No	Enable the Resend option	0
resendLabel	string	No	Label for Resend	RESEND VERIFICATION CODE
resendContainerClass	string	No	Custom class for resend container	''
resendLabelClass	string	No	Optional class for resend Label	''
resendTimerClass	string	No	Optional class for resend timer	''

---

📘 Option Descriptions

• length: Sets how many input boxes are shown (e.g., 6 for a 6-digit OTP).
• numbersOnly: If true, only numeric input is allowed in each box.
• autoFocus: Automatically focuses the first input box on load.
• isPassword: Hides characters behind dots, like a password field.
• showError: Enables error styling (e.g., red border).
• showCaps: Transform to Capital letters .
• **containerClass / inputClass / resendContainerClass / resendLabelClass / resendTimerClass **: Lets you add your own CSS classes for styling.
• containerStyles / inputStyles: Set inline styles directly from your component.
• placeholder: The character shown in empty input boxes (like * or _).
• separator: Visual separator between input boxes (like - or :).
• resend: Sets the value to show the Resend option, value will be in seconds (like 60).
• resendLabel: To change the label for resend (e.g., Resend Code).

---

🧩 Other Features

Use @ViewChild to get a reference to the component

@ViewChild(OtpAngular, { static: false }) otpRef!: OtpAngular;

🔒 Disabling Inputs

You can disable all input fields using the disabled input or programmatically:

this.otpRef.disabled.set(true);

🔁 Updating OTP Value

this.otpRef.setValue('1234');

🔁 Reset the timer of resend

this.otpRef.reset();

---

📄 License