In the past I've given several talks on GraphQL (JavaLand 2017, JUG Saxony, JUG Berlin, BEDCon 2017, OOP 2018), a query language for web API's. In those talks I've used the example of a blog application with the name "Bloggie". Today I have made the github repository of this example public so that everyone interested in this example app can see the source code.
You can find it here: https://github.com/manuel_mauky/bloggie
The app shows articles and authors both in a overview page and a details page and a comment section will be added in the future. The idea of this repository is to not only contain a single example but instead to implement the same use-case with different technologies and implementation styles.
At the moment I have a backend implemented with node.js and a frontend written with React.js and Apollo Client but in the future I'm planning to add other variants too. For example, a student I'm mentoring has compared several ways to implement GraphQL servers. This includes node.js, pure Java and Java with Java-Persistence API. So it's likely that I will add a Java implementation too.
In the frontend I'm planning to add another implementation with Angular and maybe another react-variant using a different graphql client library.
What is important to notice here is: This app is not intended for real-world usage! It's neither optimized for a good usability as a blogging platform nor can I guarantee the absence of bugs or security issues. The only purpose of the repository is to show and learn technologies and patterns around GraphQL.