---
title: strings.toUpper() function
description: >
  `strings.toUpper()` converts a string to uppercase.
menu:
  flux_v0_ref:
    name: strings.toUpper
    parent: strings
    identifier: strings/toUpper
weight: 101
---

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`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
```

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

## Parameters

### v
({{< req >}})
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)}))

```

{{< expand-wrapper >}}
{{% expand "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   |

{{% /expand %}}
{{< /expand-wrapper >}}