strip-ansi 
Strip ANSI escape codes
Install
$ npm install --save strip-ansi
Usage
var stripAnsi = require('strip-ansi');
stripAnsi('\u001b[4mcake\u001b[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