Create a Password Validator using ReactJS

Last Updated : 21 Jun, 2023

Password must be strong so that hackers can not hack them easily. The following example shows how to check the password strength of the user input password in ReactJS. We will use the validator module to achieve this functionality. We will call the isStrongPassword function and pass the conditions as its parameters.

Let us have a look at how the final project will look like:

Prerequisites:

Creating React Application And Installing Module:

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

npx create-react-app foldername

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

cd foldername

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

npm install validator

Project Structure: It will look like the following.

The updated dependencies in package.json will look like:

package.json:

"dependencies": {
    "@testing-library/jest-dom": "^5.16.5",
    "@testing-library/react": "^13.4.0",
    "@testing-library/user-event": "^13.5.0",
    "react": "^18.2.0",
    "react-dom": "^18.2.0",
    "react-scripts": "5.0.1",
    "validator": "^13.9.0",
    "web-vitals": "^2.1.4"
}

App.js: Now write down the following code in the App.js file. Here, App is our default component where we have written our code.

JavaScript

import React, { useState } from "react";
import validator from 'validator'

const App = () => {

    const [errorMessage, setErrorMessage] = useState('')

    const validate = (value) => {

        if (validator.isStrongPassword(value, {
            minLength: 8, minLowercase: 1,
            minUppercase: 1, minNumbers: 1, minSymbols: 1
        })) {
            setErrorMessage('Is Strong Password')
        } else {
            setErrorMessage('Is Not Strong Password')
        }
    }

    return (
        <div style={{
            marginLeft: '200px',
        }}>
            <pre>
                <h2>Checking Password Strength in ReactJS</h2>
                <span>Enter Password: </span><input type="text"
                    onChange={(e) => validate(e.target.value)}></input> <br />
                {errorMessage === '' ? null :
                    <span style={{
                        fontWeight: 'bold',
                        color: 'red',
                    }}>{errorMessage}</span>}
            </pre>
        </div>
    );
}

export default App