We can see different question now by specifying an ID in the URL.

But how can we view answers to those questions?

We could add a another URL parameter after the ID that would look for a string.

For example question or answer.

This would work.

But there's another way to pass information to a server I want to show

you, it's called a query string.

A query string goes at the end of a URL and it starts with a question mark.

After the question mark,

you can pass the server a key value pair separated by an equal sign.

You can separate additional key value pairs with an ampersand like you see here.

Let's use a query string to request either the answer or

the question side of the flash card.

We could use the side key to either be question or answer.

Checking for a query string is very similar to checking for

a route parameter or a cookie.

If a query string is in the request,

it will be in the request object under the query property.

In the cards routes file, let's check for the presence of a query string key site.

I'm assigning it to the variable side since question and

answer are properties on the json.

We can use the value stored inside to find the text we want to display.

First though, we need the ID of the card.

Let's create a variable to hold the ID from the route parameter.

Now we can access the two pieces of text that we want to use.

Let's store that in a constant named text.

Also I'll store a reference to the hint.

Now I'll wrap the text and

the hint into an object that I can pass into the template.

Lastly, I need to change the variable name for

in the card template from prompt to text.

This ensures the question or the answer will show up.

Let's go back to the browser and try using our query string.

The question shows up.

And the answer shows up too.

The only thing that I'd like to change is for

the hint to show up only when the question side is showing, and not the answer side.

See if you can use your understanding of Express and Java Script in general

to only show the hint on the question side of the flash card.

In the next video I'll show you my solution.