passing array of objects to a component in vue.js

You are passing it correctly. You must have something else happening behind the scenes. Ensure your template has a wrapping element. See this fiddle

<div id="vue-app">
    <h2>
        Vue App
    </h2>
    <vue-grid :fields = "[
        {name: 'Person Name', isSortable: true}, 
        {name: 'Country', isSortable: true}]"
    ></vue-grid>
</div>
<script id="vue-grid-template" type="text/x-template">
    <div>
        <h3>Grid</h3>
        <div class="grid">
            Fields are:
            <ul>
                <li v-for="field in fields">
                    {{field.name}} - {{field.isSortable}}
                </li>
            </ul>
        </div>
    </div>
</script>

<script>
    Vue.component('vue-grid', {
        props: ['fields'],
        template: '#vue-grid-template'
    });

    new Vue({
        el: '#vue-app'
    });
</script>