This blog post was originally posted on the Khaled Garbaya Blog
They are preconfigured and hidden so that you can focus on the code.
If you came across Gatsby you will notice that there is a lot of similarity between them. In this blog post I will explain the key difference between the two.
What is Gatsby?
Gatsby is a blazing fast static site generator for React. Actually, it is more than that. Think of it as a PWA (Progressive Web App) framework with best practices baked in. For example: you get code and data splitting out-of-the-box.
Why Move to Gatsby?
Gatsby lets you use a modern web stack without the setup headache. With its flexible plugin system it lets you bring your own data sources like Contentful, databases or your filesystem.
Gatsby provides code and data splitting out-of-the-box. It loads your critical HTML and CSS first. Once that's loaded it prefetches resources for other pages. That's why clicking around feels so fast.
Gatsby uses GraphQL to share data across pages. You only get the data you need in the page. At build time Gatsby will resolve the query and embed it in your page.
Gatsby project folder structure
From React Routes to Gatsby Pages
There are two types of routes:
- static – when you know all the parts that will define your route, like
- dynamic – when part of your route is only known at runtime like,
Let's assume you have the following static routes in your
Gatsby will create these routes automatically based on files you create in your
pages folder. The good news is you've already created the React components so it's a matter of copying them to the right place. The exception is the home page which should be named
index.js. You will end up with something like this:
Now that you've converted your static routes let's tackle the dynamic routes.
I will take an example of blog posts in this case loaded from Contentful. Every blog post has a unique slug used to load its content.
In a normal React app the route will look something like this.
BlogPost component will look something like this:
To create pages dynamically in Gatsby you need to write some logic in the
gatsby-node.js file. To get an idea on what is possible to do at build time check out Gatsby's node API docs.
We will use the createPages node API.
Following our Contentful example we need to create a page for each article. To do that first we need to get a list of all blog posts and then create pages for them based on their unique slug.
gatsby-node.js file will look like this:
Since you already have the
BlogPost component from your React project move it to
Your Gatsby project will look like this:
You need to make some slight modifications to your
$slug part that's passed through the context when creating the page to be able to use it in the GraphQL query.
Gatsby will pick the exported
pageQuery const and will know it's a GraphQL query string by the
From the React state to GraphQL
I will not go in depth with how to manage state with React since there are a lot of ways to achieve that. There is the new React 16 Context API or you can use other state libraries such as Redux. Using Gatsby you can request the data you need using the GraphQL data layer as shown in the previous example. This option is only available in the root components. This will change in Gatsby v2 with the new
StaticQuery feature. You can still use Redux with Gatsby if you need to.