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JavaScript React

Add an Input Mask to Enforce Phone Number Format

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We can use the react-input-mask library to enforce the format of an input box to be a phone number.

The react-input-mask package makes this very easy.

First, we run:

npm install react-input-mask --save

to install the package in our React project.

Then we can use it by adding it component provided by the package and specify the format of the input that we want to accept.

We can then use it as follows in a React component:

import React from "react";
import InputMask from "react-input-mask";

export default function App() {
  const [phone, setPhone] = React.useState("");
  return (
    <div className="App">
      <InputMask
        value={phone}
        onChange={e => setPhone(e.target.value)}
        mask="+1\(999) 999-9999"
        maskChar=" "
      />
      <p>{phone}</p>
    </div>
  );
}

We import the InuptMask component. In it, we pass in the mask prop, which contains the phone number mask.

We want to enforce the North American phone number format, so we write +1\(999) 999-9999 as the value of the mask so that we’ve to type in a North American phone number.

The value prop is the same as the value prop of a regular input element, it takes the state with the value that’s inputted.

The onChange prop is also the same as the onChange handler for an input element.

It sets the value in the input box to a state in our example by getting e.target.value and calling setPhone in it.

maskChar has the character to display when the position doesn’t have anything entered yet.

We also have the phone value displayed below the input.

Now the input box enforces the North American phone number format.

Also, we’ll see the entered value displayed after we enter something.

With the react-input-mask package, we can add a React component to enforce a phone number mask easily.

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