You don’t. You don’t store passwords in the database. You store the password hash, a string generated from the password, but from which no one can go back to the original password value.

Using Node, install bcrypt:

npm install bcrypt

Require it, and define the salt rounds value, we’ll use it later:

const bcrypt = require('bcrypt')

const saltRounds = 10

Create a password hash

Create a password hash using:

const hash = await bcrypt.hash('PASSWORD', saltRounds)

where PASSWORD is the actual password string.

If you prefer callbacks:

bcrypt.hash('PASSWORD', saltRounds, (err, hash) => {
  
})

Then you can store the hash value in the database.

Verify the password hash

To verify the password, compare it with the hash stored in the database using bcrypt.compare():

const result = await bcrypt.compare('PASSWORD', hash) 
//result is true or false

Using callbacks:

bcrypt.compare('somePassword', hash, (err, result) => {
  //result is true or false
})

Lessons in this unit:

0:	Introduction
1:	CSRF (Cross Site Request Forgery) tutorial
2:	Cross Site Scripting (XSS) tutorial
3:	SQL injection
4:	JSON Web Token (JWT) explained
5:	▶︎ How to store passwords in the database
6:	Some inputs to check for XSS issues