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# string-width [](https://travis-ci.org/sindresorhus/string-width)
> Get the visual width of a string - the number of columns required to display it
Some Unicode characters are [fullwidth](https://en.wikipedia.org/wiki/Halfwidth_and_fullwidth_forms) and use double the normal width. [ANSI escape codes](https://en.wikipedia.org/wiki/ANSI_escape_code) are stripped and doesn't affect the width.
Useful to be able to measure the actual width of command-line output.
## Install
```
$ npm install string-width
```
## Usage
```js
const stringWidth = require('string-width');
stringWidth('a');
//=> 1
stringWidth('古');
//=> 2
stringWidth('\u001B[1m古\u001B[22m');
//=> 2
```
## Related
- [string-width-cli](https://github.com/sindresorhus/string-width-cli) - CLI for this module
- [string-length](https://github.com/sindresorhus/string-length) - Get the real length of a string
- [widest-line](https://github.com/sindresorhus/widest-line) - Get the visual width of the widest line in a string
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