Parsing JSON string into record in Haskell

Question

I\'m struggling to understand this (I\'m still a bit new to Haskell) but I\'m finding the documentation for the Text.JSON package to be a little confusing. Basicall

Answer 1

I support the answer by @tibbe. However, I would like to add How you check put some default value in case, the argument misses in the JSON provided.

In tibbe's answer you can do the following:

Tweet <$> v .: "from_user"
      <*> v .:? "to_user_id"       .!= "some user here"
      <*> v .: "profile_image_url" .!= "url to image"
      <*> v .: "created_at"
      <*> v .: "id_str"             != 232131
      <*> v .: "source"

this will the dafault parameters to be taken while parsing the JSON.