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Bcryptjs is a JavaScript library that implements the Bcrypt password hashing algorithm, which is used to securely store passwords in Node.js applications: 

Here's an overview of its key methods and properties along with examples:
const bcrypt = require('bcryptjs');
const plaintextPassword = 'mysecretpassword';

bcrypt.hash(plaintextPassword, 10, (err, hash) => {
    if (err) {
        console.error('Error while hashing:', err);
    } else {
        console.log('Hashed password:', hash);
        // Store `hash` in database for user
    }
});

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BcryptJS produces a string output that includes the algorithm identifier, cost factor, salt, and hash, formatted as `$2a$<cost>$<salt>$<hash>`. This format allows the library to extract the parameters during verification, ensuring consistent hash comparisons for security.

While BcryptJS is designed for password hashing, it can technically hash any data. However, it's optimized for passwords, and other hashing algorithms like SHA-256 may be more appropriate for data integrity checks or non-sensitive information due to performance considerations.