react-native-otp-timer

A powerful, customizable, and performance-optimized OTP (One-Time Password) timer component for React Native applications. Perfect for implementing secure authentication flows with automatic resend functionality and background time tracking.

Features

• ⏱️ Accurate Timing: Precise countdown with background time calculation
• 🔄 Auto Resend: Configurable resend attempts with loading states
• 📱 Background Aware: Continues timing when app is backgrounded
• 🎨 Fully Customizable: Extensive styling and text formatting options
• ⚡ Performance Optimized: Built with React.memo and stable references
• 🔧 TypeScript Support: Fully typed with comprehensive interfaces
• 🧪 Testing Friendly: Debug mode and testing utilities included
• 🎯 Flexible API: Use as component or hook only
• 🚀 Zero Dependencies: No external dependencies except React Native

Installation

npm install react-native-otp-timer
# or
yarn add react-native-otp-timer

.

Quick Start

import React from 'react';
import { View, Alert } from 'react-native';
import OtpTimer from 'react-native-otp-timer';

const App = () => {
  const handleResend = async (attemptNumber: number) => {
    // Your OTP resend logic here
    console.log(`Resending OTP - attempt ${attemptNumber}`);
    await fetch('/api/resend-otp', { method: 'POST' });
  };

  const handleTimeout = () => {
    Alert.alert('Timeout', 'OTP has expired');
  };

  return (
    <View style={{ flex: 1, justifyContent: 'center', padding: 20 }}>
      <OtpTimer
        initialTimer={300} // 5 minutes
        resendLimit={3}
        onResend={handleResend}
        onTimeout={handleTimeout}
      />
    </View>
  );
};

export default App;

Advanced Usage

Fully Customized Implementation

import React, { useCallback } from 'react';
import { StyleSheet } from 'react-native';
import OtpTimer from 'react-native-otp-timer';

const CustomOtpTimer = () => {
  const handleResend = useCallback(async (count: number) => {
    try {
      const response = await api.resendOtp({ attempt: count });
      showSuccess('OTP sent successfully');
    } catch (error) {
      showError('Failed to send OTP');
      throw error; // Prevent timer reset on failure
    }
  }, []);

  const formatTime = useCallback((seconds: number) => {
    const mins = Math.floor(seconds / 60);
    const secs = seconds % 60;
    return `${mins}m ${secs}s remaining`;
  }, []);

  return (
    <OtpTimer
      initialTimer={600} // 10 minutes
      resendLimit={5}
      onResend={handleResend}
      onTimeout={() => navigation.goBack()}
      onLimitExceeded={() => showContactSupport()}
      containerStyle={styles.container}
      textStyle={styles.text}
      linkStyle={styles.link}
      formatText={formatTime}
      formatResendText={(attempt, max) => `Resend (${attempt}/${max})`}
      showAttemptCounter={true}
      debug={__DEV__}
    />
  );
};

const styles = StyleSheet.create({
  container: {
    backgroundColor: '#f8f9fa',
    padding: 16,
    borderRadius: 8,
  },
  text: {
    fontSize: 16,
    color: '#495057',
  },
  link: {
    fontSize: 16,
    color: '#007bff',
    fontWeight: '600',
  },
});

Hook-Only Usage

import { useOtpTimer } from 'react-native-otp-timer';

const CustomTimerComponent = () => {
  const { timer, resetTimer, isExpired, pauseTimer, resumeTimer } = useOtpTimer({
    initialTimer: 300,
    onTimeout: () => console.log('Timer expired'),
    onTick: (currentTime) => {
      if (currentTime === 60) {
        showWarning('1 minute remaining!');
      }
    },
    debug: true,
  });

  // Your custom UI implementation
  return (
    <View>
      <Text>Time: {timer}s</Text>
      <Button title="Reset" onPress={resetTimer} />
    </View>
  );
};

API Reference

OtpTimer Component Props

Prop	Type	Default	Description
initialTimer	number	Required	Initial countdown time in seconds
resendLimit	number	Required	Maximum number of resend attempts
onResend	(count: number) => Promise<void>	Required	Callback for handling OTP resend
onTimeout	() => void	undefined	Called when timer reaches zero
onLimitExceeded	() => void	undefined	Called when resend limit is exceeded
onTimerStart	(seconds: number) => void	undefined	Called when timer starts/resets
containerStyle	ViewStyle	undefined	Custom container styling
textStyle	TextStyle	undefined	Custom text styling
linkStyle	TextStyle	undefined	Custom link/button styling
limitExceededStyle	TextStyle	undefined	Custom style for limit exceeded message
formatText	(seconds: number) => string	"MM:SS"	Custom timer display formatter
formatResendText	(attempt: number, max: number) => string	"Resend"	Custom resend button text
limitExceededMessage	string	"Limit exceeded..."	Custom limit exceeded message
enabled	boolean	true	Enable/disable timer functionality
showAttemptCounter	boolean	false	Show attempt counter in UI
debug	boolean	false	Enable debug logging

useOtpTimer Hook

Parameters

interface UseOtpTimerProps {
  initialTimer: number;
  onTimeout: () => void;
  onTick?: (currentTime: number) => void;
  debug?: boolean;
}

Returns

interface UseOtpTimerReturn {
  timer: number; // Current timer value in seconds
  resetTimer: () => void; // Reset timer to initial value
  isActive: boolean; // Whether timer is currently running
  isExpired: boolean; // Whether timer has reached zero
  pauseTimer: () => void; // Pause the timer
  resumeTimer: () => void; // Resume paused timer
}

Performance Best Practices

1. Memoize Callbacks

Always use useCallback for your event handlers:

const handleResend = useCallback(async (count: number) => {
  // Your resend logic
}, []);

const handleTimeout = useCallback(() => {
  // Your timeout logic
}, []);

2. Stable Props

Avoid creating objects in render:

// ❌ Bad - creates new object on every render
<OtpTimer
  containerStyle={{ padding: 16 }}
  onResend={(count) => api.resend(count)}
/>

// ✅ Good - stable references
const containerStyle = { padding: 16 };
const handleResend = useCallback((count) => api.resend(count), []);

<OtpTimer
  containerStyle={containerStyle}
  onResend={handleResend}
/>

3. Component Memoization

The OtpTimer component is already memoized, but ensure parent components don't cause unnecessary re-renders:

const ParentComponent = React.memo(() => {
  // Component implementation
});

Background Behavior

The timer automatically handles app state changes:

• Background: Records timestamp when app goes to background
• Foreground: Calculates time spent in background and updates timer accordingly
• Accuracy: Maintains precise timing regardless of background duration

Error Handling

The component provides several ways to handle errors:

const handleResend = async (count: number) => {
  try {
    await api.resendOtp();
    // Success - timer will reset automatically
  } catch (error) {
    showError('Failed to send OTP');
    throw error; // Re-throw to prevent timer reset
  }
};

Testing

Debug Mode

Enable debug mode for development:

<OtpTimer
  debug={__DEV__}
  // ... other props
/>

Testing Configuration

Use shorter timers and higher limits for testing:

const TIMER_CONFIG = __DEV__
  ? { initialTimer: 10, resendLimit: 10 }
  : { initialTimer: 300, resendLimit: 3 };

<OtpTimer
  {...TIMER_CONFIG}
  // ... other props
/>

Migration Guide

From Basic Timer Libraries

If you're migrating from a basic countdown timer:

1. Replace timer prop with initialTimer
2. Add required onResend callback
3. Update styling props (most are compatible)
4. Add error handling to resend function

Performance Considerations

• Callbacks are automatically memoized internally
• Component uses React.memo for render optimization
• Background timing prevents unnecessary re-renders
• All intervals and listeners are properly cleaned up

Examples

Check out the examples directory for complete implementation examples including:

• Basic usage
• Custom styling
• Redux integration
• Error handling
• Testing setups

Contributing

1. Fork the repository
2. Create your feature branch (git checkout -b feature/amazing-feature)
3. Commit your changes (git commit -m 'Add amazing feature')
4. Push to the branch (git push origin feature/amazing-feature)
5. Open a Pull Request

License

MIT License - see the LICENSE file for details.

Made with ❤️ for the React Native community

Author

👤 Hamza Gulraiz

📬 Support me

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