# isAlphaNumeric
> Test whether a string contains only alphanumeric characters.
## Usage
```javascript
var isAlphaNumeric = require( '@stdlib/assert/is-alphanumeric' );
```
#### isAlphaNumeric( value )
Tests whether a string contains only alphanumeric characters.
```javascript
var bool = isAlphaNumeric( 'abc0123456789' );
// returns true
```
## Notes
- For non-string values, the function returns `false`.
- _Alphanumeric_ is defined as the characters `a-zA-Z` and the numeric characters `0-9`.
## Examples
```javascript
var isAlphaNumeric = require( '@stdlib/assert/is-alphanumeric' );
var out = isAlphaNumeric( 'abs0123456789' );
// returns true
out = isAlphaNumeric( '0xffffff' );
// returns true
out = isAlphaNumeric( '' );
// returns false
out = isAlphaNumeric( 123 );
// returns false
```
* * *
## CLI
### Usage
```text
Usage: is-alphanumeric [options] []
Options:
-h, --help Print this message.
-V, --version Print the package version.
```
### Examples
```bash
$ is-alphanumeric 01abc23456789
true
```
To use as a [standard stream][standard-streams],
```bash
$ echo -n '0123456789' | is-alphanumeric
true
```
[standard-streams]: https://en.wikipedia.org/wiki/Standard_streams