Reward Types - Questlog

Quest rewards are defined in the rewards property of a quest. They are a list of reward objects, each of which can be one of the following types:

Gives the player an item.

item: Either the item ID string (e.g. "minecraft:diamond") or a full item object containing custom components/enchantments (e.g. {"id": "minecraft:enchanted_book", "components": {"minecraft:stored_enchantments": {"levels": {"minecraft:fortune": 3}}}}).
count (optional, default: 1): The amount of the item to give the player. (Can also be defined inside the item object).

Runs a command as the player, at the player's position. If permission_level is specified, the command is run with that permission level.

command: The command to run, must be prefixed with /.
permission_level (optional, default: 2): The command's permission level, when ran as the player (player needn't have this permission level). See: Java Edition Commands - minecraft.wiki

Gives the player experience

experience: The amount of experience to give the player
level (optional, default: false): Whether to give the player levels instead of points

Gives the player loot from a loot table. The loot context is set as such:

loot_table: The loot table to give the player. If the table does not exist, it will log an error in the log.

Allows the player to choose a subset of rewards from a list of options.

choices: A list of reward objects to choose from.
pick_count (optional, default: 1): The number of choices the player is required to select.

All reward types support the following optional properties:

auto_claim (optional, default: false): If set to true, the reward will be given to the player automatically once the quest is completed, without them needing to manually click to collect it.
claim_sound (optional): The sound to play when the reward is claimed.
name (optional): The name of the reward. If omitted, a name will be automatically generated based on the reward type.
icon (optional): The icon to display for the reward.
translatable (optional, default: false): Whether the name is a translatable string.