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Grails has built-in support for a JSON building DSL, which, together with the render controller dynamic method, makes rendering JSON responses an enjoyable job. But there seems to be a lack of consolidated information in the official documentation to clarify all the bits about getting anything you want in JSON. So here’s my little mini guide to share with you.
Ground Rules
As the JSON spec reads,

JSON is built on two structures:

A collection of name/value pairs. In various languages, this is realized as an object, record, struct, dictionary, hash table, keyed list, or associative array.
An ordered list of values. In most languages, this is realized as an array, vector, list, or sequence.

So there are only two rules for rendering JSON with Grails.
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