Vue 2 - Mutating props gives warning

vue.js:2574 [Vue warn]: Avoid mutating a prop directly since the value will be overwritten whenever the parent component re-renders. Instead, use a data or computed property based on the prop's value. Prop being mutated: "list" (found in component <task>)
I have this code in main.js
Vue.component('task', { template: '#task-template', props: ['list'], created() { this.list = JSON.parse(this.list); } }); new Vue({ el: '.container' })
I know that the problem is in created() when I overwrite the list prop, but I am a newbie in Vue, so I totally don't know how to fix it. Anyone have an idea how (and please explain why) to fix it?

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