strip-ansi 
Strip ANSI escape codes
Install
$ npm install --save strip-ansi
Usage
var stripAnsi = require('strip-ansi');
stripAnsi('\x1b[4mcake\x1b[0m');
//=> 'cake'
CLI
$ npm install --global strip-ansi
$ strip-ansi --help
Usage
$ strip-ansi <input-file> > <output-file>
$ cat <input-file> | strip-ansi > <output-file>
Example
$ strip-ansi unicorn.txt > unicorn-stripped.txt
License
MIT © Sindre Sorhus