v-for without :key

[Ben-Zahler]

hi all,
we're building a frontend in vue/nuxt to a backend.
We sometimes iterate over items that are coming from backend and I'm very surprised to see that we need to provide :key items for v-for.

The objects that we have do not have ids, they can be 100% identical regarding the content and really: I don't want to worry about keys. i don't want to generate them, I don't want to maintain them, I expect my FE.-Framework to take care of things like this.

We tried to generate uniqueIds on the fly, but also this did break our page.

The only thing that reliably work for us is to omit the :key attribute on the v-for node.

Can someone explain:

• why should I generate artificial :key s in a v-for loop?
• what happens if I omit the :key ?

thanks,
Ben

[LinusBorg]

https://vuejs.org/guide/essentials/list.html#maintaining-state-with-key