Simple attribute removal code

roll20.js

var monsterData = { name:'Lich', AC:'20', HP:'99', alignment:'lawful evil', type:'undead', size:'Medium', challenge: '20' };

on('chat:message', function(msg) {
  if(msg.content === '!api-test') {
    var characterId = getObj('graphic', msg.selected[0]._id).get('represents');
    var character = getObj('character', characterId);
    var oldAttrs = findObjs({type: 'attribute', characterid: characterId});
    _.invoke(oldAttrs, 'remove');
    character.set('name', monsterData.name);
    setAttrByName(characterId, 'import_data', JSON.stringify(monsterData));
    setAttrByName(characterId, 'import_data_present', 'on');
    setAttrByName(characterId, 'sheetOutput', '@{output_to_all}');
    setAttrByName(characterId, 'deathSaveOutput', '@{output_to_all}');
  }
});

function setAttrByName(characterId, attributeName, value) {
    var attrs = findObjs({type:'attribute', name:attributeName, characterid:characterId});
    if(attrs[0]) {
        attrs[0].set('current', value);
    }
}