Parsing a JSON request
Many web services involve a request to create a new persistent object or make an update to an existing persistent object. In order to implement these kinds of operations, the application will need input from the client.
A RESTful web service will generally accept input (and produce output) in the form of JSON documents. For more information on JSON, see the Reading JSON documents recipe in Chapter 10, Input/Output, Physical Format, and Logical Layout.
Flask provides the capability to parse JSON input from web clients. This makes it possible to have a client provide sophisticated documents to a web server.
Getting ready
We'll extend the Flask application from the Parsing the query string in a request recipe earlier in this chapter to add a user registration feature; this will add a player who can then request cards. The player is a resource that will involve the essential CRUD operations:
- A client can do a
POSTto the/players...
