Convert JSON style properties names to Java CamelCase names with GSON

java json gson camelcasing
Janusz picture Janusz · Mar 3, 2010 · Viewed 52.5k times · Source

I'm using GSON to convert JSON data I get to a Java object. It works pretty well in all my tests. The problem is that our real objects have some properties named like is_online. GSON only maps them if they are named totally equal, it would be nice to have GSON convert the names to Java camel case isOnline.

It seems this is possible while creating the JSON data, camel case is converted to underscore separated words in JSON. But I can't find a way to specify this the other way round.

Answer

Hampei picture Hampei · Aug 4, 2012

I have found the following setting works perfect when reading json with underscored attributes and using camelcasing in my models.

Gson gson = new GsonBuilder()
    .setFieldNamingPolicy(FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES)
    .create()

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