Exclude route from express middleware

Even though there is no build-in middleware filter system in expressjs, you can achieve this in at least two ways.

First method is to mount all middlewares that you want to skip to a regular expression path than includes a negative lookup:

// Skip all middleware except rateLimiter and proxy when route is /example_routeapp.use(/\/((?!example_route).)*/, app_lookup);app.use(/\/((?!example_route).)*/, timestamp_validator);app.use(/\/((?!example_route).)*/, request_body);app.use(/\/((?!example_route).)*/, checksum_validator);app.use(rateLimiter);app.use(/\/((?!example_route).)*/, whitelist);app.use(proxy);

Second method, probably more readable and cleaner one, is to wrap your middleware with a small helper function:

var unless = function(path, middleware) {    return function(req, res, next) {        if (path === req.path) {            return next();        } else {            return middleware(req, res, next);        }    };};app.use(unless('/example_route', app_lookup));app.use(unless('/example_route', timestamp_validator));app.use(unless('/example_route', request_body));app.use(unless('/example_route', checksum_validator));app.use(rateLimiter);app.use(unless('/example_route', whitelist));app.use(proxy);

If you need more powerfull route matching than simple path === req.path you can use path-to-regexp module that is used internally by Express.

UPDATE :- In express 4.17 req.path returns only '/', so use req.baseUrl :

var unless = function(path, middleware) {    return function(req, res, next) {        if (path === req.baseUrl) {            return next();        } else {            return middleware(req, res, next);        }    };};

Built upon the answer from @lukaszfiszer as I wanted more than one route excluded.You can add as many as you want here.

var unless = function(middleware, ...paths) {  return function(req, res, next) {    const pathCheck = paths.some(path => path === req.path);    pathCheck ? next() : middleware(req, res, next);  };};app.use(unless(redirectPage, "/user/login", "/user/register"));

Can't add as comment sorry.

You can also skip route like this by putting a condition on req.originalUrl:

app.use(function (req, res, next) {    if (req.originalUrl === '/api/login') {    return next();    } else {         //DO SOMETHING    }