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In this video.

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Let's see how we can solve the course error.

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So now we are shifting from the client side to our server.

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So now back to our Node.js server.

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Let's go to the terminal and we are going to install a package called Cost.

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So let's clear it.

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And now and P and I and then the name of the package that is cost.

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Now it's done.

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Let's clear now and let's restart our server.

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So here that is inside the server file.

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So next is you are going to pass course as a middleware.

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So make sure that you are the course before your route.

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So here you're going to be course middleware, you make use of app dot use, and then you pass in the

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course as a function.

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Now we are done.

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So let's get back to our client side and now let's try to log login again.

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Let me clear the console here.

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Now let me try again here st.

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Now let's wait.

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This time around we got the same access error, but lucky for us we have what is called the response.

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Remember I pass in some wrong password here, so let's open the response.

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And now on the response we have what is called data.

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And this is a message from our back end with invalid login credentials and then start us called Field

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and it's coming from our API.

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If you go to the controllers and then the users and log in, which is this.

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Remember we pass in the error as invalid login credentials and that is what we are receiving.

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So now let's go ahead and log in with the right credentials.

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So let me pass in the one, two, three, four, five and let me clear the console before I send.

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Now you see, now you got something back which is beautiful than before.

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So if I open it and now I'm a data, you can see we have the user a great.

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So what we want is that we are going to save the entire user here into local storage.

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So the same thing from the back end, if I go to the API and I click send, this is what you saw inside

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the client side.

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So now everything works fine.

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Then this video, let's finish up with the reducer and then the action.