In this post to his site Jeremy Curny briefly walks you through the creation of a REST API using the Symfony 3 framework and several components/bundles to add in common functionality.

He includes the commands and dependencies you'll need to get the system set up:

• Initialize the project
• Install dependencies (including the FosRestBundle, JMSSerializerBundle and NelmioCorsBundle bundles)
• Register bundles
• Configure bundles
• Making the first route

He ends with the command to run the built-in web server and be able to test out the result. The simple action he's created can then be called using a GET request on the default/index route with a 200 OK response with "hello world" content.