In previous chapters, we learned how to use directives and form validators. We will extend our knowledge in this chapter with custom directives and custom validators. We're also going to look at how to build single-page applications (SPAs) with Angular.

Additionally, we'll explore integrating authentication into our Angular applications with two popular authentication providers: Google Firebase Authentication and Auth0.

This chapter will cover the following topics:

• Custom directives
• Custom form validators
• Building SPAs
• User authentication
• Authentication with Firebase Authentication
• Authentication with Auth0
• Wiring up the client side