html-to-whatsapp/index.js

This is a package which will convert html into whatsapp text.

async function removeTagsFromMessages(originalString) {
    let convertedMessageText = convertHTML(removeEmptyTags(originalString));
    return convertedMessageText;
  }

  function convertHTML(htmlString) {

    let result = htmlString.replace(/ /g, ' ');
      result = result.replace(/<p>/g, '\n').replace(/<br>/g, '\n');    
    result = result.replace(/<strong>(.*?)<\/strong>/g, (match, content) => {   
      const trail = content.match(/(\s+)$/);
      const trailSpace = trail ? trail[0]:' ';  
      const forward = content.match(/^(\s+)/);
      const forwardSpace = forward ? forward[0]:' ';      
      return (/^\s/.test(content) ? forwardSpace : '') + `*${content.trim()}*` + (/\s$/.test(content) ? trailSpace : '');
    });
  
  
    result = result.replace(/<em>(.*?)<\/em>/g, (match, content) => {   
      const trail = content.match(/(\s+)$/);
      const trailSpace = trail ? trail[0]:' ';
  
      const forward = content.match(/^(\s+)/);
      const forwardSpace = forward ? forward[0]:' ';
      return (/^\s/.test(content) ? forwardSpace : '') + `_${content.trim()}_` + (/\s$/.test(content) ? trailSpace : '');
  });
  
  
    result = result.replace(/<span\s+[^>]*style="[^"]*\btext-decoration:\s*line-through;[^"]*"[^>]*>(.*?)<\/span>/g, (match, content) => {   
      const trail = content.match(/(\s+)$/);
      const trailSpace = trail ? trail[0]:' ';
  
      const forward = content.match(/^(\s+)/);
      const forwardSpace = forward ? forward[0]:' ';
      return (/^\s/.test(content) ? forwardSpace : '') + `~${content.trim()}~` + (/\s$/.test(content) ? trailSpace : '');
    });
    
  
    result = result.replace(/_(.*?)_/g, (match, content) => {   
      const trail = content.match(/(\s+)$/);
      const trailSpace = trail ? trail[0]:' ';
  
      const forward = content.match(/^(\s+)/);
      const forwardSpace = forward ? forward[0]:' ';
      return (/^\s/.test(content) ? forwardSpace : '') + `_${content.trim()}_` + (/\s$/.test(content) ? trailSpace : '');
    });
    result = result.replace(/\*(.*?)\*/g, (match, content) => {   
      const trail = content.match(/(\s+)$/);
      const trailSpace = trail ? trail[0]:' ';
  
      const forward = content.match(/^(\s+)/);
      const forwardSpace = forward ? forward[0]:' ';
      return (/^\s/.test(content) ? forwardSpace : '') + `*${content.trim()}*` + (/\s$/.test(content) ? trailSpace : '');
    });
     result = result.replace(/~(.*?)~/g, (match, content) => {   
      const trail = content.match(/(\s+)$/);
      const trailSpace = trail ? trail[0]:' ';
  
      const forward = content.match(/^(\s+)/);
      const forwardSpace = forward ? forward[0]:' ';
      return (/^\s/.test(content) ? forwardSpace : '') + `~${content.trim()}~` + (/\s$/.test(content) ? trailSpace : '');
    });
 
  
    result = result.replace(/_(.*?)_/g, (match, content) => {   
      const trail = content.match(/(\s+)$/);
      const trailSpace = trail ? trail[0]:' ';
  
      const forward = content.match(/^(\s+)/);
      const forwardSpace = forward ? forward[0]:' ';
      return (/^\s/.test(content) ? forwardSpace : '') + `_${content.trim()}_` + (/\s$/.test(content) ? trailSpace : '');
    });
    result = result.replace(/\*(.*?)\*/g, (match, content) => {   
      const trail = content.match(/(\s+)$/);
      const trailSpace = trail ? trail[0]:' ';
  
      const forward = content.match(/^(\s+)/);
      const forwardSpace = forward ? forward[0]:' ';
      return (/^\s/.test(content) ? forwardSpace : '') + `*${content.trim()}*` + (/\s$/.test(content) ? trailSpace : '');
    });
     result = result.replace(/~(.*?)~/g, (match, content) => {   
      const trail = content.match(/(\s+)$/);
      const trailSpace = trail ? trail[0]:' ';
  
      const forward = content.match(/^(\s+)/);
      const forwardSpace = forward ? forward[0]:' ';
      return (/^\s/.test(content) ? forwardSpace : '') + `~${content.trim()}~` + (/\s$/.test(content) ? trailSpace : '');
    }); 
  
    result = result.replace(/<[^>]*>/g, '');
    result = result.replaceAll(/&amp;/g, '&').replaceAll(/&lt;/g, '<').replaceAll(/&gt;/g, '>')   
    return result;
  }

  function removeEmptyTags(htmlString) {
    const emptyTagRegex = /<([a-z]+)[^>]*>(?:\s*|&nbsp;)*?<\/\1>/gi;
  
    return htmlString.replace(emptyTagRegex, '');
  }

  module.exports = removeTagsFromMessages;