Cannot read property 'name' of undefined discord.js Trying to read array inside json

Question

I'm unable to retrieve from my reactions.json the emoji name to match the role.name. Not sure what I'm missing and I've been staring at it for hours. '

A bit confused as to what i'm missing here.

reactions.json

{
"channel": "test",
"channelID": "",
"roles": {
  "melee": "🪓 Melee DPS",
  "ranged": "🏹 Ranged DPS",
  "caster": "🧙🏻 Caster DPS",
  "healer": "🚑 Healer",
  "tank": "🔰 Tank"
},
"vote": {
    "melee": "🪓",
    "ranged": "🏹",
    "caster": "🧙🏻",
    "healer": "🚑",
    "beginner": "🔰"
  },
 }

Javascript

client.on('messageReactionAdd', addRole);

async function addRole({message, emojis}, user) {

if (message.partial) {
  try {
    await message.fetch();
    
  } catch (err) {
    console.error('Error fetching message', err);
    return;
  }
}

const { guild } = message;

const member = guild.members.cache.get(user.id);


const reactionsJSON = JSON.parse(fs.readFileSync('reactions.json', 'utf8'));
const { guild } = message;
const role = guild.roles.cache.find((role) => role.name === reactionsJSON[emojis.name]);

if (!role) {
  console.error(`Role not found for '${reactionsJSON[emojis]}'`);
  return;
}

try {
  member.roles.add(role.id);
} catch (err) {
  console.error('Error adding role', err);
  return;
}
}

@TheOtterlord i'm updating to include the async function. Sorry about that — f00d
– f00d, Commented Sep 13, 2021 at 13:01
ok, so whatever is calling addRole passes through an object that includes message, but that doesn't include emojis (hence it's undefined). So I think the problem lies higher up in the stack? — The Otterlord
– The Otterlord, Commented Sep 13, 2021 at 13:04

The Otterlord · Accepted Answer · 2021-09-13 13:11:04Z

Ok, I believe that the problem is the deconstruction of the MessageReaction property of the event. The object contains message, but not emojis, however it contains a value emoji which has what you lare looking for.

.emoji (read only)

The emoji of this reaction. Either a GuildEmoji object for known custom emojis, or a ReactionEmoji object which has fewer properties. Whatever the prototype of the emoji, it will still have name, id, identifier and toString()

client.on('messageReactionAdd', addRole);

async function addRole({message, emoji}, user) {

if (message.partial) {
  try {
    await message.fetch();
    
  } catch (err) {
    console.error('Error fetching message', err);
    return;
  }
}

const { guild } = message;

const member = guild.members.cache.get(user.id);


const reactionsJSON = JSON.parse(fs.readFileSync('reactions.json', 'utf8'));
const { guild } = message;
const role = guild.roles.cache.find((role) => role.name === reactionsJSON[emoji.name]);

if (!role) {
  console.error(`Role not found for '${reactionsJSON[emoji]}'`);
  return;
}

try {
  member.roles.add(role.id);
} catch (err) {
  console.error('Error adding role', err);
  return;
}
}

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