---
title: strings.toLower() function
description: strings.toLower() converts a string to lowercase.
url: https://docs.influxdata.com/flux/v0/stdlib/strings/tolower/
estimated_tokens: 877
product: Flux
version: v0
publisher: InfluxData
canonical: https://docs.influxdata.com/flux/v0/stdlib/strings/tolower/
date: '2024-04-08T16:01:02-06:00'
lastmod: '2024-04-08T16:01:02-06:00'
---

* Flux 0.18.0+

InfluxDB support

`strings.toLower()` converts a string to lowercase.

##### Function type signature

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

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

## Parameters

### v

(Required)
String value to convert.

## Examples

### Convert all values of a column to lower case

```js
import "sampledata"
import "strings"

sampledata.string()
    |> map(fn: (r) => ({r with _value: strings.toLower(v: r._value)}))
```

[](#view-example-input-and-output)

View example input and output

#### Input data

|       \_time       |\*tag|  \_value   |
|--------------------|-----|------------|
|2021-01-01T00:00:00Z| t1  |smpl\_g9qczs|
|2021-01-01T00:00:10Z| t1  |smpl\_0mgv9n|
|2021-01-01T00:00:20Z| t1  |smpl\_phw664|
|2021-01-01T00:00:30Z| t1  |smpl\_guvzy4|
|2021-01-01T00:00:40Z| t1  |smpl\_5v3cce|
|2021-01-01T00:00:50Z| t1  |smpl\_s9fmgy|

|       \_time       |\*tag|  \_value   |
|--------------------|-----|------------|
|2021-01-01T00:00:00Z| t2  |smpl\_b5eida|
|2021-01-01T00:00:10Z| t2  |smpl\_eu4oxp|
|2021-01-01T00:00:20Z| t2  |smpl\_5g7tz4|
|2021-01-01T00:00:30Z| t2  |smpl\_sox1ut|
|2021-01-01T00:00:40Z| t2  |smpl\_wfm757|
|2021-01-01T00:00:50Z| t2  |smpl\_dtn2bv|

#### Output data

|       \_time       |  \_value   |\*tag|
|--------------------|------------|-----|
|2021-01-01T00:00:00Z|smpl\_g9qczs| t1  |
|2021-01-01T00:00:10Z|smpl\_0mgv9n| t1  |
|2021-01-01T00:00:20Z|smpl\_phw664| t1  |
|2021-01-01T00:00:30Z|smpl\_guvzy4| t1  |
|2021-01-01T00:00:40Z|smpl\_5v3cce| t1  |
|2021-01-01T00:00:50Z|smpl\_s9fmgy| t1  |

|       \_time       |  \_value   |\*tag|
|--------------------|------------|-----|
|2021-01-01T00:00:00Z|smpl\_b5eida| t2  |
|2021-01-01T00:00:10Z|smpl\_eu4oxp| t2  |
|2021-01-01T00:00:20Z|smpl\_5g7tz4| t2  |
|2021-01-01T00:00:30Z|smpl\_sox1ut| t2  |
|2021-01-01T00:00:40Z|smpl\_wfm757| t2  |
|2021-01-01T00:00:50Z|smpl\_dtn2bv| t2  |

#### Related

* [strings.toTitle() function](/flux/v0/stdlib/strings/totitle/)
* [strings.toUpper() function](/flux/v0/stdlib/strings/toupper/)
* [strings.title() function](/flux/v0/stdlib/strings/title/)
| _time | *tag | _value |
| --- | --- | --- |
| _time | *tag | _value |
| 2021-01-01T00:00:00Z | t1 | smpl_g9qczs |
| 2021-01-01T00:00:10Z | t1 | smpl_0mgv9n |
| 2021-01-01T00:00:20Z | t1 | smpl_phw664 |
| 2021-01-01T00:00:30Z | t1 | smpl_guvzy4 |
| 2021-01-01T00:00:40Z | t1 | smpl_5v3cce |
| 2021-01-01T00:00:50Z | t1 | smpl_s9fmgy |

| _time | *tag | _value |
| --- | --- | --- |
| _time | *tag | _value |
| 2021-01-01T00:00:00Z | t2 | smpl_b5eida |
| 2021-01-01T00:00:10Z | t2 | smpl_eu4oxp |
| 2021-01-01T00:00:20Z | t2 | smpl_5g7tz4 |
| 2021-01-01T00:00:30Z | t2 | smpl_sox1ut |
| 2021-01-01T00:00:40Z | t2 | smpl_wfm757 |
| 2021-01-01T00:00:50Z | t2 | smpl_dtn2bv |

| _time | _value | *tag |
| --- | --- | --- |
| _time | _value | *tag |
| 2021-01-01T00:00:00Z | smpl_g9qczs | t1 |
| 2021-01-01T00:00:10Z | smpl_0mgv9n | t1 |
| 2021-01-01T00:00:20Z | smpl_phw664 | t1 |
| 2021-01-01T00:00:30Z | smpl_guvzy4 | t1 |
| 2021-01-01T00:00:40Z | smpl_5v3cce | t1 |
| 2021-01-01T00:00:50Z | smpl_s9fmgy | t1 |

| _time | _value | *tag |
| --- | --- | --- |
| _time | _value | *tag |
| 2021-01-01T00:00:00Z | smpl_b5eida | t2 |
| 2021-01-01T00:00:10Z | smpl_eu4oxp | t2 |
| 2021-01-01T00:00:20Z | smpl_5g7tz4 | t2 |
| 2021-01-01T00:00:30Z | smpl_sox1ut | t2 |
| 2021-01-01T00:00:40Z | smpl_wfm757 | t2 |
| 2021-01-01T00:00:50Z | smpl_dtn2bv | t2 |