How do you hash passwords in Node.js?

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In Node.js, password hashing is done to securely store user passwords instead of saving them as plain text. A common library for this is bcrypt.

Steps to hash a password:

1. Install bcrypt

npm install bcrypt

2. Hash the password

const bcrypt = require("bcrypt");
const saltRounds = 10; // complexity

async function hashPassword(plainPassword) {
  const hash = await bcrypt.hash(plainPassword, saltRounds);
  return hash;
}

3. Verify the password (during login)

async function verifyPassword(plainPassword, hashedPassword) {
  const match = await bcrypt.compare(plainPassword, hashedPassword);
  return match; // true if correct
}

Best Practices:

• Always use salt (bcrypt does this automatically) to protect against rainbow table attacks.

• Use a strong saltRounds (10–12) for security without excessive delay.

• Never store plain-text passwords.

Summary: Bcrypt in Node.js securely hashes passwords with salting, making stored credentials safe even if the database is compromised.

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