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Method Override:

Provides faux HTTP method support.

Pass an optional key to use when checking for
a method override, otherwise defaults to _method.
The original method is available via req.originalMethod.

String key
returns Function

Source

module.exports = function methodOverride(key){
  key = key || "_method";
  return function methodOverride(req, res, next) {
    var method;
    req.originalMethod = req.originalMethod || req.method;

    // req.body
    if (req.body && typeof req.body === 'object' && key in req.body) {
      method = req.body[key].toLowerCase();
      delete req.body[key];
    }

    // check X-HTTP-Method-Override
    if (req.headers['x-http-method-override']) {
      method = req.headers['x-http-method-override'].toLowerCase();
    }

    // replace
    if (supports(method)) req.method = method.toUpperCase();

    next();
  };
};

supports()

Check if node supports method.

Source

function supports(method) {
  return ~methods.indexOf(method);
}