Rewards

Item

After completing the quest the player will get an item. Note: This doesnt have a nbt option (yet).

"rewards": [
    {
      "id": "quest_giver:item",
      "item": {
        "count": 1,
        "item": "minecraft:experience_bottle"
      }
    }
  ]

Command

When the quest is done a command will run. Commands Wiki

Note: The command will run from the player. Find the player that completed the quest with @s

"rewards": [
    {
      "id": "quest_giver:command",
      "command": "Insert Command String"
    }
  ]

"rewards": [
    {
      "id": "quest_giver:command",
      "command": "effect give @s minecraft:speed 30 1"
    }
  ]

FTB Command Reward

FTB Commands

"rewards": [
    {
      "id": "quest_giver:command",
      "command": "ftbquests change_progress @s complete-all"
    }
  ]

Custom Rewards

Modders can make Custom Reward Options