React Native Mask Input

A simple and effective Text Input with mask for ReactNative on iOS, Android, and Web. No fancy stuff, it's basically a JavaScript function that allow you to use custom masks easily.

• Features
• Installation
• Usage
• Props
• Mask
  • Using function mask
  • Obfuscation
  • Predefined Masks
  • createNumberMask
• Example
• formatWithMask

Features

• Highly customizable masks with the use of RegExp
• Characteres obfuscation!
• It's just a <TextInput/> component, no fancy/complex stuff
• Use React Native ES6, Typescript and React Hooks
• Exports the function that do all the magic: formatWithMask

Installation

npm install react-native-mask-input

or

yarn add react-native-mask-input

Usage

import MaskInput from 'react-native-mask-input';

function MyComponent() {
  const [phone, setPhone] = React.useState('');

  return (
    <MaskInput
      value={phone}
      onChangeText={(masked, unmasked) => {
        setPhone(masked); // you can use the unmasked value as well

        // assuming you typed "9" all the way:
        console.log(masked); // (99) 99999-9999
        console.log(unmasked); // 99999999999
      }}
      mask={['(', /\d/, /\d/, ')', ' ', /\d/, /\d/, /\d/, /\d/, /\d/, '-', /\d/, /\d/, /\d/, /\d/]}
    />
  );
}

Props

Prop	Type	Default	Description
...TextInputProps			Inherit all props of TextInput.
value	number		The value for controlled input. REQUIRED
onChangeText	function		Callback that is called when the input's text changes. differently of the default function, this one receives three arguments: (maskedText, unmaskedText, obfuscatedText) => void REQUIRED
mask	Mask		An array where each item defines one character of the value. If the item is a string, that string will be used, if it is an RegExp, it will validate the input on it.
showObfuscatedValue	boolean	false	Whether or not to display the obfuscated value on the TextInput.
placeholderFillCharacter	string	_	Character to be used as the "fill character" on the default placeholder value.
obfuscationCharacter	string	*	Character to be used on the obfuscated characteres.

Mask

An array where each item defines one character of the value. If the item is a string, that string will be used, if it is an RegExp, it will validate the input on it.

To be clear: All the characters you want to be inputed by the user must be a RegExp in your mask.

If you want a mask for Zip Code, for example, you'd do like this:

const zipCodeMask = [/\d/, /\d/, /\d/, /\d/, /\d/, '-', /\d/, /\d/, /\d/];

That's because the RegExp /\d/ accepts any digit character (0-9)

import { formatWithMask } from 'react-native-mask-input'

const { masked, unmasked, obfuscated } = formatWithMask({
  text: '71680345',
  mask: zipCodeMask,
});

console.log(masked); // "71680-345"
console.log(unmasked); // "71680345"
console.log(obfuscated); // "71680-345"

Using function mask

The mask can also be a function that receives the current value and returns the array mask. That's to help you to change the mask dynamically based on the value.

import MaskInput from 'react-native-mask-input'

const CPF_MASK = [/\d/, /\d/, /\d/, ".", /\d/, /\d/, /\d/, ".", /\d/, /\d/, /\d/, "-", /\d/, /\d/]
const CNPJ_MASK = [/\d/, /\d/, ".", /\d/, /\d/, /\d/, ".", /\d/, /\d/, /\d/, "/", /\d/, /\d/, /\d/, "-", /\d/, /\d/]

function MyComponent() {
  const [value, setValue] = React.useState('');

  return (
    <MaskInput
      value={value}
      onChangeText={setValue}
      mask={(text) => {
        if (text.replace(/\D+/g, "").length <= 11) {
          return CPF_MASK
        } else {
          return CNPJ_MASK
        }
      }}
    />
  );
}

Obfuscation

To mark a character as obfuscated, use the RegExp within an array, like this:

const creditCardMask = [/\d/, /\d/, /\d/, /\d/, " " [/\d/], [/\d/], [/\d/], [/\d/], " ", [/\d/], [/\d/], [/\d/], [/\d/], " ", /\d/, /\d/, /\d/, /\d/];

function MyComponent() {
  const [creditCard, setCreditCard] = React.useState('');

  return (
    <MaskInput
      value={creditCard}
      mask={creditCardMask}
      showObfuscatedValue
      obfuscationCharacter="#"
      onChangeText={(masked, unmasked, obfuscated) => {
        setCreditCard(unmasked); // you can use the masked value as well

        // assuming you typed "1234123412341234":
        console.log(masked); // "1234 1234 1234 1234"
        console.log(unmasked); // "1234123412341234"
        console.log(obfuscated); // "1234 #### #### 1234"
      }}
    />
  );
}

You need to use the prop showObfuscatedValue in order to show the obfuscated value on the input

Predefined Masks

in order to perhaps help some of you, some commonly used masks are exported, if it does not fit your use case I hope it'll at least serve as an inspiration:

import MaskInput, { Masks } from 'react-native-mask-input';

function MyComponent() {
  const [creditCard, setCreditCard] = React.useState('');

  return (
    <MaskInput
      value={creditCard}
      onChangeText={setCreditCard}
      mask={Masks.CREDIT_CARD}
    />
  );
}

Mask	Use case
Masks.BRL_CAR_PLATE	ABC-1234
Masks.BRL_CPNJ	33.594.232/0001-00
Masks.BRL_CPF	903.549.000-21
Masks.BRL_CURRENCY	R$ 1.234,56
Masks.BRL_PHONE	(61) 99966-7746
Masks.CREDIT_CARD	9999 **** **** 9999
Masks.DATE_DDMMYYYY	12/04/1995
Masks.DATE_MMDDYYYY	04/12/1995
Masks.DATE_YYYYMMDD	1995/04/12
Masks.ZIP_CODE	71680-345

createNumberMask(numberOptions)

This is a helper function to create a number mask, you'd use this on currency input cases for example.

import MaskInput, { createNumberMask } from 'react-native-mask-input';

const dollarMask = createNumberMask({
  prefix: ['R', '$', ' '],
  delimiter: '.',
  separator: ',',
  precision: 2,
})

function MyComponent() {
  const [value, setValue] = React.useState('');

  return (
    <MaskInput
      value={value}
      mask={dollarMask}
      onChangeText={(masked, unmasked) => {
        setValue(unmasked); // you can use the masked value as well

        // assuming you typed "123456":
        console.log(masked); // "R$ 1.234,56"
        console.log(unmasked); // "123456"
      }}
    />
  );
}

numberOptions

Name	Type	Default	Description
prefix	Mask	[]	Mask to be prefixed on the mask result.
delimiter	string	.	Character for thousands delimiter.
separator	string	,	Decimal separator character.
precision	number	2	Decimal precision.

Example

See EXAMPLE

git clone https://github.com/caioquirinomedeiros/react-native-mask-input.git
cd react-native-mask-input/example
yarn
yarn android / yarn ios

formatWithMask(options)

import { formatWithMask, Masks } from 'react-native-mask-input';

const creditCard = '9999999999999999';

const { masked, unmasked, obfuscated } = formatWithMask({
  text: phone,
  mask: Masks.CREDIT_CARD,
  obfuscationCharacter: '-',
});

console.log(masked); // 9999 9999 9999 9999
console.log(unmasked); // 9999999999999999
console.log(obfuscated); // 9999 ---- ---- 9999

options

Name	Type	Default	Description
text	string		Text to be formatted with the mask.
mask	Mask		An array where each item defines one character of the value. If the item is a string, that string will be used, if it is an RegExp, it will validate the input on it.
obfuscationCharacter	string	*	Character to be used on the obfuscated characteres.

Contributing

See the contributing guide to learn how to contribute to the repository and the development workflow.

License

react-native-mask-input is released under the MIT license. See LICENSE for details.

Any question or support will welcome.