Check credentials against user store

As an example, we'll look up the user name in a prepopulated static array of usernames and passwords and check if the password supplied matches the password that exists for that user name in the array. This example is a simplification of the process of looking up the credentials in a real-world user store.

• Node.js

The file module users.js in our implementation contains the following code, which sets up the array users and defines the validate function. The validate function checks username and password pairs that are passed to it by looking them up in the users array.

const users = [
  {
    username: 'AzureDiamond',
    password: 'hunter2',
  },
  {
    username: 'sosecure',
    password: 'password',
  },
]

function validate(username, password) {
  return users.some(user => user.username === username && user.password === password);
}

exports.validate = validate;

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