Simple auto-paragraph for JavaScript

auto-paragraph.js

/**
 * Convert text containing newlines to paragraph'd markup.
 *
 * @param {String} text Text to add p tags to
 *
 * @return {String} Returns paragraphized text
 */
function autoParagraph ( text ) {
  return '<p>' + text.split( /\n+/ ).join( '</p>\n<p>' ) + '</p>';
}

/**
 * Angular flavor.
 */
App.filter( 'autoParagraph', function () {
  return function ( text ) {
    return '<p>' + text.split( /\n+/ ).join( '</p>\n<p>' ) + '</p>';
  }
});

This is good for markdown stuff but may suggest something more advanced if you want: https://github.com/mavin/node-wordpress-autop/blob/master/index.js

Amazing - thanks. To transfer single line-breaks into <br/>:

'<p>' + text.split(/\n{2,}/).join( '</p><p>' ).split(/\n/).join( '<br/>' ) + '</p>'