show.ejs

<div id="app">
    <h1>Tasks - show</h1>
    <hr />
    <h1>title : {{ item.title }}</h1>
    <div v-text="item.content"></div>
</div>

<!-- -->
<script>
new Vue({
    el: '#app',
    created () {
        var id = "<%= params_id %>";
        this.getItem(id)
    },    
    data: {
//       tasks: [],
        item : [],
        title:'',
        content:''        
    },
    methods: {
        getItem: function(id) {
            axios.get("/api/tasks_show/" + id )
            .then(res =>  {
//                res.data.result
                var dat = res.data.result
                this.item = dat;
                console.log( dat )
            })            
        }
    }

});
</script>