Data fetch from REST api appear on browser but not appear on android device (phone)

Hi, im just starting to learn about framework7-vue

I manage to fetch api and make list appear on browser

My code in home.vue :

        <f7-list-item v-for="ul in userlist" link="/about/" :key="" :title=""></f7-list-item>
    <f7-block strong>
        <p>update 12.38am Here is your MyGuru Framework7 app. Let's see what we have here.</p>

export default {
    // Write your Vue component logic here
    name: 'Home',
    data() {
        return {
            title: 'hello world',
            userlist: []
    mounted() {
        var self = this;
        this.$f7ready((f7) => {
            // Init cordova APIs (see cordova-app.js)
            if (f7.device.cordova) {
            fetch('').then(res => res.json()).then(data => {
                self.userlist = data;

but when i try to run on my android device it just won’t appear.

Can someone help me? what is the correct way to fetch REST Api and use it on framework7-vue and run on android cordova?

Attach your phone or simulator to Chrome browser dev tools and see where is the issue?