[Chartjs]-Getting data into script tag from route?

You should run all those queries in parallel using Promise.all and when all of them done render chart

const userPromise =  db.User.findOne({
                       where: {
                         username: req.session.user
                       }
                     });

const tasksWithCountPromise = db.Tasks.findAndCountAll({
                attributes: ['category'],
                where: {
                    UserUsername: req.session.user
                },
                group: 'category'
            }).then(function (result) {
                for (var i = 0; i < result.rows.length; i++) {
                    categoryList.push(result.rows[i].dataValues.category);
                    countList.push(result.count[i].count);
                }
                return { countList, categoryList };
            });

const allTasksPromise = db.Tasks.findAll({
                where: {
                    UserUsername: req.params.username
                }
            });

Promise.all(userPromise, tasksWithCountPromise, allTasksPromise)
 .then(([user, tasksWithCount, allTasks]) => {
     res.render('index', {
                data: allTasks,
                helpers: {
                    photo: user.dataValues.picURL,
                    countList: tasksWithCount.countList,
                    categoryList: tasksWithCount.categoryList
                }
            })
   });