How to use 'express urlencoded' in JavaScript

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return function urlencoded(req, res, next) {
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  if (req._body) return next();
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  req.body = req.body || {};
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  // check Content-Type
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  if ('application/x-www-form-urlencoded' != utils.mime(req)) return next();
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  // flag as parsed
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  req._body = true;
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  // parse
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  limit(req, res, function(err){
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    if (err) return next(err);
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    var buf = '';
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    req.setEncoding('utf8');
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    req.on('data', function(chunk){ buf += chunk });
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    req.on('end', function(){
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      try {
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        req.body = buf.length
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          ? qs.parse(buf, options)
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          : {};
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        next();
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      } catch (err){
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        err.body = buf;
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        next(err);
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      }
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    });
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  });
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}

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export function bodyUrlEncoded() {
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  return urlencoded({ extended: true });
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}