Parse Json array with Circe

Question

I'm beginner in Circe and I would like retrieve information from this JSon

[  
   {  
      "sha":"7fd1a60b01f91b314f59955a4e4d4e80d8edf11d",
      "commit":{  
         "author":{  
            "name":"The Octocat",
            "email":"[email protected]",
            "date":"2012-03-06T23:06:50Z"
         },
         "committer":{  
            "name":"The Octocat",
            "email":"[email protected]",
            "date":"2012-03-06T23:06:50Z"
         },
         "message":"Merge pull request #6 from Spaceghost/patch-1\n\nNew line at end of file.",
      },
      "url":"https://api.github.com/repos/octocat/Hello-World/commits/7fd1a60b01f91b314f59955a4e4d4e80d8edf11d",
   },
   {  
      "sha":"762941318ee16e59dabbacb1b4049eec22f0d303",
      "commit":{  
         "author":{  
            "name":"Johnneylee Jack Rollins",
            "email":"[email protected]",
            "date":"2011-09-14T04:42:41Z"
         },
         "committer":{  
            "name":"Johnneylee Jack Rollins",
            "email":"[email protected]",
            "date":"2011-09-14T04:42:41Z"
         },
         "message":"New line at end of file. --Signed off by Spaceghost",
      },
      "url":"https://api.github.com/repos/octocat/Hello-World/commits/762941318ee16e59dabbacb1b4049eec22f0d303",
   },
]

I don't understand how this code doesn't catch information about 'author'

val doc= parse(response.json.toString()).getOrElse(Json.Null)
doc.hcursor.downArray.downField("commit").right.as[Seq[String]] match {
   case Left(failure) => println("Fail")
   case Right(json) => println("Ok")
}

Do you have an idea ?

Thank in advance,

Can you provide some more information? What type is response? What are your imports? — Tanjin
– Tanjin, Commented Oct 15, 2017 at 2:00

Dmytro Mitin · Accepted Answer · 2017-10-15 08:02:58Z

Your json contains trailing commas in some places. This is against specification.

  val json =
  """[
  {
    "sha":"7fd1a60b01f91b314f59955a4e4d4e80d8edf11d",
    "commit":{
      "author":{
      "name":"The Octocat",
      "email":"[email protected]",
      "date":"2012-03-06T23:06:50Z"
    },
      "committer":{
      "name":"The Octocat",
      "email":"[email protected]",
      "date":"2012-03-06T23:06:50Z"
    },
      "message":"Merge pull request #6 from Spaceghost/patch-1\n\nNew line at end of file."
    },
    "url":"https://api.github.com/repos/octocat/Hello-World/commits/7fd1a60b01f91b314f59955a4e4d4e80d8edf11d"
  },
  {
    "sha":"762941318ee16e59dabbacb1b4049eec22f0d303",
    "commit":{
      "author":{
      "name":"Johnneylee Jack Rollins",
      "email":"[email protected]",
      "date":"2011-09-14T04:42:41Z"
    },
      "committer":{
      "name":"Johnneylee Jack Rollins",
      "email":"[email protected]",
      "date":"2011-09-14T04:42:41Z"
    },
      "message":"New line at end of file. --Signed off by Spaceghost"
    },
    "url":"https://api.github.com/repos/octocat/Hello-World/commits/762941318ee16e59dabbacb1b4049eec22f0d303"
  }
  ]"""

  case class Author(name: String, email: String, date: String)
  case class Committer(name: String, email: String, date: String)
  case class Commit(author: Author, committer: Committer, message: String)
  case class Record(sha: String, commit: Commit, url: String)

  decode[Seq[Record]](json) match {
      case Right(records) => records.foreach(record => println(record.commit.author))
      case Left(error) => println(error)
  }

//Author(The Octocat,[email protected],2012-03-06T23:06:50Z)
//Author(Johnneylee Jack Rollins,[email protected],2011-09-14T04:42:41Z)

And code like yours works as well:

val doc= parse(json).getOrElse(Json.Null)
doc.hcursor.downArray.downField("commit").downField("author").downField("name").as[String] match {
  case Left(failure) => println(failure)
  case Right(name) => println(name)
}
// The Octocat

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