This is an optional extension step, just for fun. It assumes you've already finished the tutorial.
We could make the CMS even better, by making it possible to retrieve and view individual blog posts. Let's take a look at how we can do that.
Step 1 - URL parameters
We don't want to have to write a handler for each URL in our application. Express's URL parameters let us specify dynamic sections of the a URL - a space for a blog post ID or username, for example. You can think of them as function arguments being passed to your server.
Express's URL parameters use a : for dynamic parts of the URL:
/users/:userId - matches URLs like /users/123, /users/node-girls
/users/:userId/posts/:postId - matches URLs like /users/node-girls/posts/node-is-best
Let's add a handler for serving individual blog posts:
Step 2 - Reading from the file and sending the specific blog post
Just like with /create-post, you need to read your JSON file. Try and send the post content back to the browser:res.send(postContentHere)
Step 3 - Rendering a template
Right now we're just sending the plain text of your blog post, but you probably want to jazz up your post with some HTML and CSS. For this, we can use Express's built in templating system. You can use any template language you want (like pug/jade, ejs, or handlebars), but we're going to use mustache (which is very similar to handlebars) in this example.
Run npm install --save mustache-express, then check the documentation for mustache-express and Express's templating. You'll need to create a template file in views/post.mustache like this:
