Question

I found many things about converting Groovy to JSON, but oddly enough, not the other way.

What is the (best) JSON to Groovy parser around there ?

Answer 1

Because compiled Groovy classes are compatible with Java classes, you should be able to use any Java library for converting JSON to POJOs (or POGOs). Jackson is a fairly popular choice which you can use to convert JSON like this:

String json = '{
  "name" : { "first" : "Joe", "last" : "Sixpack" },
  "gender" : "MALE",
  "verified" : false,
  "userImage" : "Rm9vYmFyIQ=="
}'

to a Map using:

Map<String,Object> userData = mapper.readValue(json, Map.class)

Or if you want to convert the JSON to a Groovy User class:

User userData = mapper.readValue(json, User.class)

This will map properties in the Groovy class to keys in the JSON.

In the code above, mapper is an instance of com.fasterxml.jackson.databind.ObjectMapper from the Jackson library.