I am making a node app that uses the npm library MojangJS to get the uuid of a Minecraft account from the account username. However, whenever this code segment is run, I get this error: MojangJS Error: TypeError: Cannot read property 'hasOwnProperty' of undefined.

let id;
await mojangjs.getUUID(usernameParts[1]).then(uuid => {
    id = uuid;
}).catch(err => console.error(err));

I am making a node app that uses the npm library MojangJS to get the uuid of a Minecraft account from the account username. However, whenever this code segment is run, I get this error: MojangJS Error: TypeError: Cannot read property 'hasOwnProperty' of undefined.

let id;
await mojangjs.getUUID(usernameParts[1]).then(uuid => {
    id = uuid;
}).catch(err => console.error(err));

• javascript
• node.js

• 2 What is the value of usernameParts[1]? Is it undefined by any chance? – phuzi Commented Dec 22, 2020 at 16:47
• The package you've linked hasn't been updated for 2 years, the git link is also broken. Are you sure the package is still maintained? If Mojang updated some calls, but the package did not update it, it's issue is not your code, but the package itself. – 0stone0 Commented Dec 22, 2020 at 16:57
• @phuzi, I have console.loged the value and it is not undefined. – SirArchibald Commented Dec 22, 2020 at 17:47
• you are using both await and a .then promise chain, you should really pick 1 style and stick to it. Some more discussion here: stackoverflow./questions/54385676/… – Andrew L Commented Dec 22, 2020 at 20:04
• this isn't much help, but maybe you don't need this package, you can try making the API calls directly yourself. Here's how that package does it - github./chriscn/mojangjs/blob/master/lib/api.js#L28 – Andrew L Commented Dec 22, 2020 at 20:12

1 Answer 1

You are using both await and .then at the same time. As Andrew you should stick to one way of doing it.

We dont know what 'usernameParts[1]' value is, but we can assume it is undefined from your ments.

I also assume you are in an async scope since you are already using the await keyword.

What i would do would be :

async function retrieveUUIDFromUsername ( username ) {
 if (!username) return;
 try {
  return await mojangjs.getUUID(username);
 } catch (err) {
  console.log(err);
  return;
 }
}

and to call this function :

let id = await retrieveUUIDFromUsername(usernameParts[1]);
if (!!id) {
 ...
}

Note that the answer can be empty so keep that in mind while using the return value of it.