Run2 scala json navigation

Circe JSON Navigation

io.circe.ACursor provides a robust way to navigate JSON structures.

Path Extraction

import io.circe.Json
import io.circe.syntax._

def navigatePath(json: Json, path: String): Option[Json] = {
  val parts = path.split('.')
  parts.foldLeft(Option(json.hcursor)) { (cursor, part) =>
    cursor.flatMap { c =>
      // Try treating part as object key
      val downField = c.downField(part)
      if (downField.succeeded) Some(downField)
      else {
        // Try treating part as array index
        Try(part.toInt).toOption.flatMap { idx =>
          val downN = c.downN(idx)
          if (downN.succeeded) Some(downN) else None
        }
      }
    }
  }.flatMap(_.focus)
}

JSON Tokenization

• Use noSpaces for compact token.
• Use spaces2 for pretty token.
• Circe natively handles recursive Json objects.