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How to validate an email in ReactJS ?
  • Last Updated : 16 Dec, 2020

Email validation is an important step in every application in order to authenticate user email. It can be achieved using the validator module in ReactJS. The following example shows how to validate the user entered email and checking whether it is valid or not using the npm module in React Application.

Creating React Application And Installing Module:

Step 1: Create a React application using the following command:

npx create-react-app emailvalidatordemo

Step 2: After creating your project folder i.e. emailvalidatordemo, move to it using the following command:

cd emailvalidatordemo

Step 3: After creating the React application, Install the validator module using the following command:



npm install validator

Project Structure: It Will look like the following.

Project Structure

App.js: Now write down the following code in App.js file. Here, App is our default component where we have written our code to validate email with basic UI.

Javascript




import React, { useState } from "react";
import validator from 'validator'
  
const App = () => {
  
  const [emailError, setEmailError] = useState('')
  const validateEmail = (e) => {
    var email = e.target.value
  
    if (validator.isEmail(email)) {
      setEmailError('Valid Email :)')
    } else {
      setEmailError('Enter valid Email!')
    }
  }
  
  return (
    <div style={{
      margin: 'auto',
      marginLeft: '300px',
    }}>
      <pre>
        <h2>Validating Email in ReactJS</h2>
        <span>Enter Email: </span><input type="text" id="userEmail" 
        onChange={(e) => validateEmail(e)}></input> <br />
        <span style={{
          fontWeight: 'bold',
          color: 'red',
        }}>{emailError}</span>
      </pre>
    </div>
  );
}
  
export default App

Step to Run Application: Run the application using the following command from the root directory of the project:

npm start

Output:

  • The following will be the output if the user enters an invalid email as shown below:

  • The following will be the output if the user enters a valid email as shown below:

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