How to Generate Random Password in ReactJS ?

Generating random passwords is basic requirement for applications that has user authentication, registration, or security-related functionalities. In ReactJS, you can create a simple function to generate strong and random passwords for users. In this article, we will guide you through the process of building a Random Password Generator using React.

We will use Math.random() and Math.floor() methods to generate random characters.

Prerequisites

• Introduction to React
• React states
• React events
• JSX Syntax

Approach

To gene­rate a random password, the application utilizes the­ `generatePassword` function. This function constructs the­ password by iterating through selecte­d character sets based on use­r preference­s. For easy password copying, the application includes the­ functionality of `copyToClipboard`. This feature uses a te­mporary textarea ele­ment and provides users with a succe­ss message once the­ir password is successfully copied.

Steps to Create React Application

Step 1: Create a react application by using this command

npx create-react-app random-password-generator

Step 2: After creating your project folder, i.e. react-project, use the following command to navigate to it:

cd random-password-generator

Project Structure

Example: Write the following code in App.js file

Javascript

// App.js
import React, { useState } from "react";

const containerStyle = {
    maxWidth: "400px",
    margin: "1rem",
    padding: "20px",
    border: "1px solid #ccc",
    borderRadius: "8px",
    boxShadow: "0px 0px 10px 0px grey",
};

const inputContainerStyle = {
    display: "flex",
    alignItems: "center",
    marginBottom: "10px",
};

const labelStyle = {
    flex: "1",
};

const inputStyle = {
    padding: "5px",
    border: "1px solid #ccc",
    borderRadius: "3px",
};

const checkboxContainerStyle = {
    display: "flex",
    alignItems: "center",
    marginBottom: "5px",
};

const buttonStyle = {
    padding: "10px 15px",
    backgroundColor: "#007bff",
    color: "#fff",
    border: "none",
    borderRadius: "5px",
    cursor: "pointer",
    transition: "background-color 0.2s ease-in-out",
};

const copyButtonStyle = {
    marginLeft: "10px",
};

const App = () => {
    const [password, setPassword] = useState("");
    const [passwordLength, setPasswordLength] = useState(12);
    const [useSymbols, setUseSymbols] = useState(true);
    const [useNumbers, setUseNumbers] = useState(true);
    const [useLowerCase, setUseLowerCase] = useState(true);
    const [useUpperCase, setUseUpperCase] = useState(true);
    const [successMessage, setSuccessMessage] = useState("");

    const generatePassword = () => {
        let charset = "";
        let newPassword = "";

        if (useSymbols) charset += "!@#$%^&*()";
        if (useNumbers) charset += "0123456789";
        if (useLowerCase) charset += "abcdefghijklmnopqrstuvwxyz";
        if (useUpperCase) charset += "ABCDEFGHIJKLMNOPQRSTUVWXYZ";

        for (let i = 0; i < passwordLength; i++) {
            newPassword += charset.charAt(Math.floor(Math.random() * charset.length));
        }

        setPassword(newPassword);
    };

    const copyToClipboard = () => {
        const el = document.createElement("textarea");
        el.value = password;
        document.body.appendChild(el);
        el.select();
        document.execCommand("copy");
        document.body.removeChild(el);
        setSuccessMessage("Password copied to clipboard!");
        setTimeout(() => setSuccessMessage(""), 2000);
        // Hide message after 2 seconds
    };

    return (
        <div style={containerStyle}>
            <h1
                style={{
                    color: "green",
                    textAlign: "center",
                }}
            >
                Geeksforgeeks
            </h1>
            <h3 style={{ textAlign: "center" }}>Random Password Generator</h3>
            <div style={inputContainerStyle}>
                <label style={labelStyle}>Password Length:</label>
                <input
                    type="number"
                    min="8"
                    max="32"
                    value={passwordLength}
                    onChange={(e) => setPasswordLength(e.target.value)}
                    style={inputStyle}
                />
            </div>
            <div style={checkboxContainerStyle}>
                <label>
                    <input
                        type="checkbox"
                        checked={useSymbols}
                        onChange={() => setUseSymbols(!useSymbols)}
                    />
                    Symbols
                </label>
                <label>
                    <input
                        type="checkbox"
                        checked={useNumbers}
                        onChange={() => setUseNumbers(!useNumbers)}
                    />
                    Numbers
                </label>
                <label>
                    <input
                        type="checkbox"
                        checked={useLowerCase}
                        onChange={() => setUseLowerCase(!useLowerCase)}
                    />
                    LowerCase
                </label>
                <label>
                    <input
                        type="checkbox"
                        checked={useUpperCase}
                        onChange={() => setUseUpperCase(!useUpperCase)}
                    />
                    UpperCase
                </label>
            </div>
            <button style={buttonStyle} onClick={generatePassword}>
                Generate Password
            </button>
            {password && (
                <div style={inputContainerStyle}>
                    <label style={labelStyle}>Generated Password:</label>
                    <input type="text" value={password} readOnly style={inputStyle} />
                    <button
                        style={{
                            ...buttonStyle,
                            ...copyButtonStyle,
                        }}
                        onClick={copyToClipboard}
                    >
                        Copy
                    </button>
                </div>
            )}
            {successMessage && (
                <p
                    style={{
                        color: "green",
                        textAlign: "center",
                    }}
                >
                    {successMessage}
                </p>
            )}
        </div>
    );
};

export default App;

Step to run the application: Open the Terminal and type the command mentioned below to open the program.

npm start

Output:

Generate Random Password in React