---
title: strings.toUpper() function
description: strings.toUpper() converts a string to uppercase.
url: https://docs.influxdata.com/flux/v0/stdlib/strings/toupper/
estimated_tokens: 1376
product: Flux
version: v0
---

# strings.toUpper() function

-   Flux 0.18.0+
-   View InfluxDB support

`strings.toUpper()` converts a string to uppercase.

#### toUpper vs toTitle

The results of `toUpper()` and `toTitle()` are often the same, however the difference is visible when using special characters:

```no_run
str = "dz"

strings.toUpper(v: str) // Returns DZ
strings.toTitle(v: str) // Returns Dz
```

##### 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 upper case

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

sampledata.string()
    |> map(fn: (r) => ({r with _value: strings.toUpper(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.toLower() function](/flux/v0/stdlib/strings/tolower/)
-   [strings.title() function](/flux/v0/stdlib/strings/title/)