---
title: hash.xxhash64() function
description: >
  `hash.xxhash64()` converts a string value to a 64-bit hexadecimal hash using the xxHash algorithm.
menu:
  flux_v0_ref:
    name: hash.xxhash64
    parent: contrib/qxip/hash
    identifier: contrib/qxip/hash/xxhash64
weight: 301

---

<!------------------------------------------------------------------------------

IMPORTANT: This page was generated from comments in the Flux source code. Any
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To make updates to this documentation, update the function comments above the
function definition in the Flux source code:

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Fluxdoc syntax: https://github.com/influxdata/flux/blob/master/docs/fluxdoc.md

------------------------------------------------------------------------------->

`hash.xxhash64()` converts a string value to a 64-bit hexadecimal hash using the xxHash algorithm.



##### Function type signature

```js
(v: A) => string
```

{{% caption %}}
For more information, see [Function type signatures](/flux/v0/function-type-signatures/).
{{% /caption %}}

## Parameters

### v
({{< req >}})
String to hash.




## Examples

### Convert a string to 64-bit hash using xxHash

```js
import "contrib/qxip/hash"

hash.xxhash64(v: "Hello, world!")// Returns 17691043854468224118


```