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 do these kinds of operation, 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 8, Input/Output, Physical Format, and Logical Layout

How can we parse JSON inputs from web clients? What's an easy way to validate the input?

Getting ready

We'll extend the Flask application from the Parsing the query string in a request recipe to add a user registration feature; this will add a...