Question

I am using Jackson and would like to pretty-print JSON such that each element in arrays goes to each line, like:

{
  "foo" : "bar",
  "blah" : [
    1,
    2,
    3
  ]
}

Setting SerializationFeature.INDENT_OUTPUT true only inserts newline characters for object fields, not array elements, printing the object in this way instead:

{
  "foo" : "bar",
  "blah" : [1, 2, 3]
}

Does anyone know how to achieve this? Thanks!

Answer 1

You could extend the DefaultPrettyPrinter and override the methods beforeArrayValues(…) and writeArrayValueSeparator(…) to archieve the desired behaviour. Afterwards you have to add your new Implementation to your JsonGenerator via setPrettyPrinter(…).