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How to validate Password is strong or not in ReactJS?
  • Last Updated : 08 Jan, 2021

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. 

Syntax: 

isStrongPassword(str [, options])

Parameters: This function accepts two parameters as mentioned above and described below:

  • str: It is the input value of the string type.
  • options: It is an optional parameter. These are options that are checked for the input password. For example minLength, minLowercase, etc.

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.

Project Structure

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 />
        <span style={{
          fontWeight: 'bold',
          color: 'red',
        }}>{errorMessage}</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 a weak password.

 

  • The following will be the output if the user enters a strong password.

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