useVueVForKey

HTML

Summary

Rule available since: v2.3.11
Diagnostic Category: lint/correctness/useVueVForKey
This rule is recommended, meaning it is enabled by default.
This rule doesn’t have a fix.
The default severity of this rule is error.
This rule belongs to the following domains:
- vue
Sources:
- Same as vue/require-v-for-key

How to configure

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{
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  "linter": {
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    "rules": {
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      "correctness": {
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        "useVueVForKey": "error"
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      }
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    }
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  }
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}

Description

Enforce that elements using v-for also specify a unique key.

When rendering lists with v-for, Vue relies on a key to track elements efficiently. The key can be provided via longhand v-bind:key or shorthand :key. If you need to animate the entrance/exit of an item in a list, the key should be a unique identifier for each item in the list, and not the index of the item.

For more information, see the Vue documentation on list rendering.

Examples

Invalid

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<li v-for="item in items">{{ item }}</li>

Valid

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<li v-for="item in items" :key="item.id">{{ item }}</li>

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<li v-for="item in items" v-bind:key="item.id">{{ item }}</li>

Related rules:

useVueValidVFor