---
title: "b64encode( input, [encoding] ) | Grafana k6 documentation"
description: "Encode data in base64."
---

# b64encode( input, \[encoding] )

Expand table

| Parameter           | Type                 | Description                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
|---------------------|----------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| input               | string / ArrayBuffer | The input string or `ArrayBuffer` object to base64 encode.                                                                                                                                                                                                                                                                                                                                                                                                                                   |
| encoding (optional) | string               | The base64 encoding to use.  <br />Available options are:  <br />\- **“std”**: the standard encoding with `=` padding chars and `+` and `/` characters in encoding alphabet. This is the default.  <br />\- **“rawstd”**: like `std` but without `=` padding characters.  <br />\- **“url”**: URL safe version of `std`, encoding alphabet doesn’t contain `+` and `/` characters, but rather `-` and `_` characters.  <br />\- **“rawurl”**: like `url` but without `=` padding characters. |

### Returns

Expand table

| Type   | Description                              |
|--------|------------------------------------------|
| string | The base64 encoding of the `input` data. |

### Example

JavaScript ![Copy code to clipboard](/media/images/icons/icon-copy-small-2.svg) Copy

```javascript
import { check } from 'k6';
import encoding from 'k6/encoding';

export default function () {
  const str = 'hello world';
  const enc = 'aGVsbG8gd29ybGQ=';
  const buf = new Uint8Array([104, 101, 108, 108, 111, 32, 119, 111, 114, 108, 100]).buffer;
  check(null, {
    'is encoding string correct': () => encoding.b64encode(str) === enc,
    'is encoding ArrayBuffer correct': () => encoding.b64encode(buf) === enc,
  });
}
```