---
title: string() function
description: >
  `string()` converts a value to a string type.
menu:
  flux_v0_ref:
    name: string
    parent: universe
    identifier: universe/string
weight: 101
flux/v0/tags: [type-conversions]
introduced: 0.7.0
---

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

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`string()` converts a value to a string type.



##### Function type signature

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

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

## Parameters

### v
({{< req >}})
Value to convert.




## Examples

- [Convert basic types to strings](#convert-basic-types-to-strings)
- [Convert all values in a column to strings](#convert-all-values-in-a-column-to-strings)

### Convert basic types to strings

```js
string(v: true)
// Returns "true"

string(v: 1m)
// Returns "1m"

string(v: 2021-01-01T00:00:00Z)
// Returns "2021-01-01T00:00:00Z"

string(v: 10.12)
// Returns "10.12"
```


### Convert all values in a column to strings

If converting the `_value` column to string types, use `toString()`.
If converting columns other than `_value`, use `map()` to iterate over each
row and `string()` to convert a column value to a string type.

```js
data
    |> map(fn: (r) => ({r with exampleCol: string(v: r.exampleCol)}))

```

{{< expand-wrapper >}}
{{% expand "View example input and output" %}}

#### Input data

| _time                | *tag | exampleCol  |
| -------------------- | ---- | ----------- |
| 2021-01-01T00:00:00Z | t1   | -2.18       |
| 2021-01-01T00:00:10Z | t1   | 10.92       |
| 2021-01-01T00:00:20Z | t1   | 7.35        |
| 2021-01-01T00:00:30Z | t1   | 17.53       |
| 2021-01-01T00:00:40Z | t1   | 15.23       |
| 2021-01-01T00:00:50Z | t1   | 4.43        |

| _time                | *tag | exampleCol  |
| -------------------- | ---- | ----------- |
| 2021-01-01T00:00:00Z | t2   | 19.85       |
| 2021-01-01T00:00:10Z | t2   | 4.97        |
| 2021-01-01T00:00:20Z | t2   | -3.75       |
| 2021-01-01T00:00:30Z | t2   | 19.77       |
| 2021-01-01T00:00:40Z | t2   | 13.86       |
| 2021-01-01T00:00:50Z | t2   | 1.86        |


#### Output data

| _time                | exampleCol  | *tag |
| -------------------- | ----------- | ---- |
| 2021-01-01T00:00:00Z | -2.18       | t1   |
| 2021-01-01T00:00:10Z | 10.92       | t1   |
| 2021-01-01T00:00:20Z | 7.35        | t1   |
| 2021-01-01T00:00:30Z | 17.53       | t1   |
| 2021-01-01T00:00:40Z | 15.23       | t1   |
| 2021-01-01T00:00:50Z | 4.43        | t1   |

| _time                | exampleCol  | *tag |
| -------------------- | ----------- | ---- |
| 2021-01-01T00:00:00Z | 19.85       | t2   |
| 2021-01-01T00:00:10Z | 4.97        | t2   |
| 2021-01-01T00:00:20Z | -3.75       | t2   |
| 2021-01-01T00:00:30Z | 19.77       | t2   |
| 2021-01-01T00:00:40Z | 13.86       | t2   |
| 2021-01-01T00:00:50Z | 1.86        | t2   |

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