Moodle 3.x Developer's Guide

JavaScript Object Notation (JSON)

Recall that our completion chart is to be rendered at the client end (by the browser), which means we will need to transfer the data across the internet from the server to the browser. If you are familiar with data transfer mechanisms then you will be aware that when you transfer data across networks then the data payload is packaged inside an envelope. The data needs to be sufficiently well described by the sender such that when the receiver unpacks it they know what it is and, potentially, what they can do with it. The packing and unpacking needs to be fast and efficient. At the time of writing, JSON has become the standard data interchange format for data transfer tasks such as the one we face. Luckily, ...