Uibuilder and vue router

Put it in perspective: you said it was in your data() of the vue app in index.js, but you were passing them as props to my-summary. How did my-summary get it? Through the props.
Since this is a vue-router topic I’m assuming IndexView is reached through the router rather than being directly nested in your outer app?
This would be the regular way to do so: https://router.vuejs.org/guide/essentials/passing-props.html#boolean-mode
I am however also assuming by its name that your env is not something easily passed in the url. Can you explain what the variable is and what you use it for? It might be better handling this differently, and there’s more than one way leading to Rome.