Call to Socket.IO from register.js returning err, as an empty object { }

[Stackoverload]

I'm making a call from register.js to socket.io using the following function

function validateInviteCode(code, use, callback) {
	callback = callback || function() {};
	var invite_code_notify = $('#invite_code_notify');
	
	if (!code.includes(':') || code.split(':')[1].length != 8) {
		showError(invite_code_notify, 'Invalid invite code');
		return callback();
	}
	
	socket.emit('plugins.invite.checkInviteCode', {
		code: code,
		use: use
	}, function(err, valid) {
		if (err) {
			console.log(err);
			app.alertError(err.message);
			return callback();
		}
		
		console.log(valid);
		if (valid) {
			showSuccess(invite_code_notify, successIcon);
		} else {
			showError(invite_code_notify, 'Invalid invite code');
		}
		
		callback();
	});
}

and it's returning err as an empty object { }. This is my server-side listen for it:

checkInviteCode: function (socket, data, fn) {
checkCode(data.code, data.use, function(valid) {
console.log(data, valid);
fn(!socket.uid, valid);
});
}

[yariplus]

In your server code, looks like your responding with a boolean value !socket.uid when it expects an Error object or null. You can use a ternary operator ? : to check the uid and send the appropriate response.

Also, the data parameter should always be a plain object, and not a literal value.

e.g.
fn(!socket.uid ? new Error("Invalid uid") : null, {valid: valid})

[Stackoverload]

Ooops! I'm sorry haha, this headache is giving me coding troubles. Thanks!