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Password Verification in Node.js

Last Updated : 14 Oct, 2021
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In Node for password hashing and verification we can use a npm library known as bcryptjs npm-bcryptjs. Installation of bcryptjs: Node.js contains an inbuilt crypto module's randomBytes interface which is used to obtain the secure random numbers. 
npm install bcryptjs
Approach:
  • To hash a password use bcrypt.hash(plainTextPassword, salt, callback) which returns a promise if no callback is passed.
  • To verify plain text password with hashed password use bcrypt.compare(plainTextPassword, hashedPassword, callback) which also returns a promise if no callback is passed.
Example 1: javascript 
// Use bcryptjs module
const bcrypt = require("bcryptjs");

// Store the password into variable
const password = "password123";

// Use bcrypt.hash() function to hash the password
bcrypt.hash(password, 8, (err, hashedPassword) => {
    if (err) {
        return err;
    }
    
    // Display the hashed password
    console.log(hashedPassword);
    
    // Use bcrypt.compare() function to compare
    // the password with hashed password
    bcrypt.compare(password, hashedPassword, (err, isMatch) => {
        if( err ) {
            return err;
        }
        
        // If password matches then display true
        console.log(isMatch);
    });
});
Output: 
$2a$08$PV4rYpBwXUPAGuMedxUnAOxq/TozK9o/QSUWaKE1XL8psOyZ.JL4q
true
Example 2: javascript 
// Use bcryptjs module
const bcrypt = require("bcryptjs");

// Store the password into variable
const password = "password123";

// Use bcrypt.hash() function to hash the password
bcrypt.hash(password, 8).then(hashedPassword => {
 
    // Display the hashed password
    console.log(hashedPassword);
    
    // Compare the password with hashed password
    // and return its value 
    return bcrypt.compare(password, hashedPassword);
 
}).then(isMatch => {
 
    // If password matches then display true
    console.log(isMatch);
}).catch(err => {

    // Display error log
    console.log(err);
});
Output: 
$2a$08$LKZU9S9WVs3C.S/zpu2U7eua/ocfzD1ytF68QPT5M600auT6M.SxG
true

S

ShubhamPal4
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