Token authentication in Angular 4 using web API

In this tutorial, we will see how to implement the token authentication in the Angular side. We will call the Token API from the Angular 4 project to get the bearer token. And then we will send the bearer token in the Authorization header to the other API to get the data back using the Angular Http request. We have a login page on which the token API is called using the HTTP POST method and then after receiving the token, we are redirecting the user to the Display data page on which we call the other REST API with the HTTP GET method with the same token and display the data. We will also see the other settings which have to be done in the Web API side to allow the cross domains to access the web API.