terraform/website/docs/language/functions/index_function.mdx

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---
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page_title: index - Functions - Configuration Language
description: The index function finds the element index for a given value in a list.
---
# `index` Function
`index` finds the element index for a given value in a list.
```hcl
index(list, value)
```
The returned index is zero-based. This function produces an error if the given
value is not present in the list.
## Examples
```
> index(["a", "b", "c"], "b")
1
```
## Related Functions
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* [`element`](/language/functions/element) retrieves a particular element from a list given
its index.